First off ... backplate. If you're thinking about a long, I second the recommendation of someone else who said contact either Tobin (Deep Sea Supply) or Fred (FredT) directly to discuss sizing. Fred has a well-written sizing paper that will tell you how to measure your torso to assure the correct size backplate. I'm not sure Tobin has anything written down, but he can certainly assist you in selecting an appropriate size plate.
Not coincidentally, these two make the highest-quality plates I've seen anywhere. They are on almost opposite ends of the spectrum, however, when it comes to bend angle and channel depth. Fred's plate has the most bend and deepest channel of any plate I've tried. Tobin's has the least bend and shallowest channel. Which you choose will depend on the tradeoff you want to make between a plate that will make your cylinder hug your body (DSS) vs. one that will reduce the risk of banging your head into your first stage (FredT). Your choice.
You mentioned using different cylinders and not liking weight on a belt ... this might be a factor in favor of a DSS plate. Tobin's plate weights screw right into (and effectively become part of) the backplate. It's a sweet system, and you can order either 5# or 8# weight sets. I don't know of another plate manufacturer that offers anything like it.
Wings ... the DSS 30# wing is sturdy and will serve you will for wreck diving. So will the Oxycheq 30# Signature series wing. The former is a horseshoe-shaped wing with a center-mounted inflator/dump (used exactly as you use a doubles wing), and the latter is a donut-shaped wing with the more standard singles configuration of putting the inflator/dump on the left side of the wing. I've used both, and am very happy with how they both perform.
Someone mentioend Dive Rite wings ... well made products, but I'm not nuts about how they perform compared to the two I already mentioned. I've owned two Dive Rite wings (Venture and Rec Wing) and replaced them both after trying the Oxycheq wings.
Finally, customer service ... Tobin's record of being available/returning phone calls, and responding to product queries/issues is way better than Patrick's ... since Oxycheq moved to Florida, Patrick just doesn't seem to be as accessible as he used to be. In the past few weeks I've called on both a wing issue and an O2 analyzer issue, and haven't been able to get ahold of him ... and he hasn't returned my messages. I love Oxycheq products ... and own a lot of his gear ... but in all honesty, the customer service leaves something to be desired.
... Bob (Grateful Diver)
