Halcyon. Not all the way, though.
I'm a fan of Scott Koplin's plates (Oxycheq).
Webbing, hardware and crotch strap from
Dive Gear Express | Equipment for Experienced Divers
Halcyon wings for all of my rigs.
ScubaPro cam bands. They come apart completely, allowing you to rig up with the backplate laying down, rather than trying to slide a backplate and wing over a standing tank... A huge advantage on a rocking boat.
Single tank rigs get a "light" STA (the hourglass-shaped one, not the "mini") from Scott Koplin (Oxycheq).
Halcyon and Oxycheq plates are very similar, but the Oxys are made with a nicer finish and better deburring, IMHO.
In my experience, there's been absolutely no equal to Halcyon's wings - the others that I've tried always have plastic hoses that are too long and need to be modified to be of proper length, and their geometry is better thought out and streamlined than others I've tried. Halcyon's customer service is tops, too - any time I've ever had a problem with anything, I have always gotten a replacement free of charge, usually in 2 business days (everything I do is by mail, and so they often have sent me product before receiving a part back). For what it's worth, my diving is commercial, and I own several rigs, all with Halcyon wings. The only problem I've ever had with any of them is when one of my guys doesn't take care of his gear and holes a wing or unthreads a stitch. Again, I've never had to patch or sew - I've always gotten a free replacement.
I'm not a fan of the "H" logo webbing, and find that Dive Gear Express' webbing is the right thickness and stiffness, without being overly so. Keeps it's color, too, even in serious conditions and after thousands of dives.
I haven't seen Halcyon's Infinity system, but my general feeling is the same as what's expressed above - that plastic parts and additional complexity is somewhat diluting Halcyon's "simplicity and ruggedness" image... Perhaps this is a good thing, but IMHO, it's not.
When buying gear, I recommend going straight to the source and cutting out as many middlemen as possible - buy directly from Oxycheq, Dive Gear Express, and Halcyon. If you can't buy direct from Halcyon, buy from the owner's (JJ's) dive shop - Extreme Exposure in High Springs, FL. That way, any issues you have with pricing, product, shipping, etc. can always be addressed directly.
Tobin's got an excellent reputation here on SB. I have never done business with him, but have seen him treat customers very poorly, right here on this board. It was so painful to watch that I actually stepped in and said something, which resulted in him having me banned from his "section" of ScubaBoard. I literally spend upwards of $30k/yr on dive gear - Tobin will never see one penny of that, based on how I saw him work.
...But apparently my distaste for his methodolgy is not shared. His reputation here is stellar.
If I had to choose Infinity vs. DSS directly (and couldn't build my own like I mention above), I'd do a Halcyon Infinity (Eclipse 30), remove all of the plastic parts (it'd therefore be a simple Halcyon BP/wing) and replace the webbing with all black webbing from Dive Gear Express (just 'cause I think the little H's are a bit rediculous-looking). I'd then mount unbent D-rings on my chest (replacing the bent ones - I'm not a fan of them, even in cold water) and call it a day. The Halcyon backplate is a little "blingy" (it's shiny), but very good quality.
The knobs on the bottom dump of all wings can be removed. Halcyon used to sell them without a knob - now all of their wings have knobs that can be removed. The knob is a nonissue until you wear multiple stage bottles and the knob gets stuck between the bottles and may "burp" your wing inadvertently. Knobless bottom dumps are less of a problem than they sound - when you reach back, you're not looking for the string anyway - you're looking for the dump valve. Make an "okay" sign around it and pull - the string's there and works fine with or without the knob.
For what it's worth, those bottom dumps without knobs still have a knot... So the difference is really "knob vs. knot," not "knob vs. no knob." The difference is very slight, functionally no different, and only an issue when you're wearing multiple stages.