The best way to learn about all this stuff is to find a shop in your area that has people working there that are nice... I live in so-cal and there is a shop here call SSP and the people there are always really nice and willing to answer all my questions... with that said the next best thing is the forums, alot of people her are willing to help you out.
The first thing I am going to do is get a set of springs which will lower the car. I dont like the gap between the wheel and the wheel well. I havn't figured out how much to lower it yet but here is a website you can check out.
http://www.modacar.com/products/Acura/RSX/MODASPR/ ... When you lower your car you will have a rougher ride but I dont mind that. Now if your willing to spend the money on engine upgrades there is a whole slew of stuff you can do, one of the first things I am going to do is either get a Super Charger or Turbo Charger. Check out these two links for more information
http://www.cybernationmotorsports.com (Turbo) or
http://www.jacksonracing.com (Super Charger)
If you dont want to spend that much money or dont want to run a forced induction motor you can check out
http://www.todaracing.com/products/h...ngine_kit.html ...
Most people will only Get a Cold Air Intake (CAI) and an exhaust. This will give you noticibly more HP.
Yes, you can always buy the wing from Acura later and install it yourself if you wish. You have to remember that if you buy an aftermarket body kit it will come unpainted. (except what you buy from Acura) Hope this helps, if you need any more info on what I discussed just ask... I can point you in the right direction.