first off im glad you were able to find good prices on buying the componets to your back plate wings set up seperate, ive noticed a few companies such as dive rite and OMS perfer you buy your whole set up from them and there for are starting to charge an arm and a leg for the individual parts, unless you pick your set up and buy it all at once,
as far as equipment goes (and i know ill get crap for this from the dir guys) most of the tech divers or at least divers with doubles at my local shop and i use an oms setup we all use the the delux strap set up with the shoulder quick release buckle (this makes a huge difference, exspecially if you use this set up in a rescue diver class or durring a practice emergancy scenerio, just try to get some one out of a single strap set up under stress) for the wings we sort of all agree on the overkill approach its unnesecary but we all use the oms 94lbs winge with the retraction bands, actually one of our instrustors took the bands off and the large wings still dont cause a problem, i mean i guess if you are doing deep penetration they wouldnt be the most streamlined choice, but we use these set ups for our fun dives in 30ft in the local lakes and doing deep/ wreck dives in Lake michigan and superior, i know i like having the lift, i am a bigger guy and with my ss back plate 2peice 7mm wet suite and a lp 121 steel i carry 6-8 lbs lead, so far i havent had a problem if i move in to more inclosed inviroments yeah ill proabaly get wings that are more streamlined but with these i could float me and 3 other people on the surface if i ever needed, plus i could use these wings with a rental aluminum 80 if i needed or double lp 121s with almost any gear i want to carry along whither its a camera or a pony and stage bottle, this is a personal preferance of course, but thats my 2cents
ps this set up works great with a weight harness which i would sugest over a weight belt, but definitly over any of the weight integrated pockets avalible for the bp/w setups