I dive a Stealth 2.0 too.... I use steel cylinders as i dive dry in the UK coldwaters. I absolutely love it, when i bought mine only the "classic" was available, but now you have the options of the tec version or very soon the new rec version too. (The rec version is the same as the tec, just a smaller bladder size i believe) (somebody please correct me if i'm wrong there?)
I tried the butt plate and very quickly ditched it, it's more awkward to use, less comfortable and adds nothing of value in my (limited) experience. I use standard metal low profile D rings which i've added, right up next to the square D rins and find my steel cylinders trim out very nicely, i have changed the loop bungee for 8mm instead of the 6mm provided, just because it's easier to use when wearing the Drysuit.
If i were buying now, with the availablility of the new Tec Wing, i'd buy a setup with that included now, mainly because i like the moveable LPI and OPV and that it's fixed to the harness. It's too expensive as a standalone wing to be worthwhile me changing from my classic wing! I regularly dive with a single stage (Ali80) and it's never been close to being maxed out, given that stages/deco (Ali80's) are almost neutral from very early on in their use, i'd have no problem stacking another couple if my dives needed them.
In my (not so) expert opinion, i'd say you'll have no problems with a Stealth, if you like the design, it will work wonderfully for you, probably better than many others because it is just SO adjustable!
If the price is similar, go with the tec wing.... if the price difference is bigger than you're happy with, you'll still be very happy with the Classic i'm sure, i know i am!
Best Regards, let us all know what you go for and how you get on with it in the end????