There are basically 3 versions of the Fusion Bullet:
1. The standard commercially available one.
2. The military version that is all blacked out - this is not much different than the commercially available one except it does not have the Aqualung logo printed on the neoprene skin and uses black thread instead of white (sometimes blue) along the seams. Not worth the extra cost for this model in my opinion.
3. The Apeks Kevlar version - this is sold as an option for those who penetrate wrecks and caves as the kevlar skin is supposed add more abrasion resistance than the neoprene skin alone. The reality is that the gain in abrasion resistance is offset by the fact the suit is heavier and takes longer to dry.
Starting a year ago or so, Aqualung changed the zipper from a brass YKK drysuit zipper to plastic YKK drysuit zipper. My preference is a brass zipper but I have not heard/seen any complaints about the plastic zipper.
The Si-Tech QCS oval wrist cuff ring system gives the most versatility with regards to what dryglove system you can readily pair with the suit:
1. Si-Tech Antares - this is the original dryglove system designed for the oval cuff rings, but it is not recommended as it is fragile and tended to leak if not perfectly oriented on the cuff ring.
2. Fourth Element Ellipse - this was an attempt to make a better low profile oval dryglove system, and it is not a very good system. You can search for and read my review of this system on the board.
3. Si-Tech Virgo - this is the QCS oval ring system's analog to the Si-tech Glove Lock dryglove system designed for their older larger diameter QCP wrist cuff rings. It is not a bad system but is a tad bulky.
4. Waterproof Ultima DGS - this is a workhorse of dryglove system that works very well. A new version has recently come out that has tabs molded into the glove rings to assist with removing after a dive.
5. Rolock 90 - This is a nother workhorse of a dryglove system that is easy to set up, easy to put on and remove, and is my current recommendation.
All 5 of the above systems are readily integrateable right out of the box with the QCS oval cuff rings.
I am not sure what you mean by "dry hood". I have a neoprene hood that was marketed as a wetsuit hood, and I have a neoprene hood that was marketed as a drysuit hood. When diving a drysuit, because your core is comfortably warm, your body does not need to shunt blood away from your extremeties and head, so a well fitting neoprene hood (5 to 6mm thick) is typically enough to keep one comfortable after the initial cold shock right after submerging. I have dived with a 6mm neoprene hood in water temps down to 2c and was fairly comfortable.
I am not sure what version of Si-Tech's neck ring system comes on current Fusion Bullet suits, but earlier models (at least through model year 2020) had the Si-Tech Neck-tite system. It works well to retain the neck seal and makes it easy to replace the seal in the field should one suffer a torn seal, but it is Si-Tech's 1st generation neck ring system. Their 2nd generation, the Quick neck worked the same but is more flexible. Their 3rd generation, the Orust, uses plastic clips to retain the neck seal and is even more flexible. My recommendation if one has a choice is the Quick Neck as I have heard of folks having issues with seal retention with Orust due to its flexibility and one needs to carry a stash of clips in case they are lost or broken...the Orust is a good design on paper but seems to fall down in execution, I am sure there are fans of it out there though, so YMMV. The neck ring system allows for the use of a silicone, latex, or neoprene seal.
You can have the Si-Tech ring systems installed on just about any drysuit and then use one of the readily integrateable dryglove systems above, or instead of the Si-Tech wrist cuff ring system, one can have any dryglove system installed....zip seals, Kubi, etc. I am not 100% sure but my understanding is Santi's dryglove system only works with their cuff rings and their cuff rings are only available as an OEM option on their suits.
A convenience zipper seems like a good idea until you realize that you just added potential major failure point to your suit. The more common approach is to add a P-valve. It can be used in and out of the water to relieve oneself where as a convenience zipper is only good out of the water. There are lots of discussions on ScubaBoard discussing P-valves and all the intricacies among the different models.
While there are dryboot attachment systems, they are largely unheard of in the recreation dive industry. A suit will typically either have attached boots, or a sock made of neoprene or fabric similar to the suit itself. There are pros and cons for either setup. This is something you will need to research and decide for yourself if/when you choose a drysuit model. My preference is to not have attached boots as in my opinion this gives me more options for thermal protection in different water temps...my wife, on the other hand, prefers to have attached boots as it makes it easier for her put on her suit and lacks the fuss in bending over to pull boots on over the sock feet and then tie the laces or otherwise secure them in place.
Suspenders built into the suit are a good option to have and most suits but not all have them.
Other options are front vs back zip, where the dump valve is located, and I am sure there are few other knick knacks I am forgetting about. All of these are preference oriented and things like dump valve location are typically only options when ordering a custom made suit...or if one has interest in patching the hole for their current dump valve location and making a new one for their preferred spot. Again, suit modifications have been discussed quite a bit on the board and something that you will need to search the board about to educate yourself.
Fusion boots are just a canvas boot that is designed to integrate with the Fusion drysuit. There is velcro in the boot that lines up with velcro on the sock of the suit and a plastic plate that goes in the sock to help "lock" the boot on the suit. There are also velcro tabs on the boot that marry up with velcro on the ankle cuff of the Fusion's skin to help retain the boot in place. These make it so one can semi-permanently attach the boots to the Fusion suit making it quicker and easier to put the suit and eliminates the need to stand in the socks of the suit against mother earth which could potentially compromise the sock feet of the suit. The con of the Fusion boot offer much in the way of ankle support, but neither do neoprene booties, so if that is an issue then you should look for a different rock boot. The pros of the fusion boots, in addtion to what I already mentioned, is that they dry quickly, are easy to remove to replace if need be, and are low profile so you typically don't need new/larger size fins like one would with other rock boots. I use the same fins that I use when diving with wetsuit and neoprene booties.
One last thing, related to the replacement skin you linked to, the Drycore and Aircore suits have different attachment systems around the zipper. It is important to contact a seller before purchasing to ensure you are buying the correct skin for the suit core that you have, as they are not interchangeable....the Drycore uses velcro attachment (and so do some of the very early Aircore models, circa 2015-2016). From 2017 onwards, the Aircore model uses the rapid zip attachment system. One is not necessarily better than the other but it is an important thing to note to ensure you don't waste money on a "good deal" that turns out to not be compatible with your suit.
One other thing....you can read and read and read all about drysuits, but you will truly become knowledgeable and understand after you start diving in one.
Hope that help some.
-Z
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