Srtblubyu, could you tell us how "trying the boost thing messed up your car bad?" Since this vehicle is turbo-charged, naturally the easiest way to increase horsepower would be to increase boost and further increase the vehicle's efficiency. If upping your boost created huge problems, then you may have something wrong that may need rectifying.
boost, fuel, timing. bending the TB is a thread in & of itself. never heard that one before.
why dont you buy a used s1 (at least) & work from there. for all intents & purposes, you could do "fine" w/ s1 plus agp wga and a boost controller. gotta watch egt's. recommend dyno on that. but it's cheap.
when it comes to cars, i need stuff in a "package", so s2 for me. no engine probs @ all. well, i had hard starts that miraculously cured itself.