You might like the Scubapro Knighthawk. It has enough lift for cold water diving in a drysuit or 8/7 semi-dry, it is a back inflate, integrated weights...There is 1 roll-down pocket and when not in use or rolled down, you can't tell that it has pockets. I have the women's version (the Ladyhawk).
People rave about the Hydros Pro but it's crazy $ and people have had issues with it breaking on the strap.
My only strong personal feelings are that I am not a fan of Aqua Lung's integrated weight system. I have assisted with many classes and have seen others on trips with me that have accidentally lost these because they come out way too easily without them tugging. They also do not easily snap in when a lot of weight is in it or the weight itself will cause it to come undone. I believe part of it to be a design issue because the locking mechanism is deep within the pocket so it's difficult to ensure that it's in place and can easily be undone with a slight tug (or not!). Since you will be doing cold water diving and will likely have more weight, you will experience accidental dropping more so than in warm water diving because of the weight itself. (I've mostly observed this happening in cold water.) I'd rather have something that takes a very purposeful motion to be removed rather than something that will come out unexpectedly on accident. I've seen it one too many times to be able to recommend it to people.
Wear it and try to do it before you decide. Other BCs with integrated weights, such as Scubapro, have a much better design with a large male and female clip. Inserting and removing weights are a very purposeful event and I have not experienced or witnessed someone losing their weights or pockets because of this. There is a visual and very audible confirmation that it is secure when put in place. The same goes for removal.
I would also suggest not purchasing the i3 inflation system, though convenient, due to serviceability. It's best to go with something that can easily be repaired when you are away from your home dive shop or while traveling. A traditional inflator hose....
Go try a few on, see what fits you best, and then step back and decide. If you end up loving an Aqua Lung i3 integrated weight BC the best, so be it..!