[crazy_canuck]

I don't have gear grinds and all that crap, so i'll just say this: There are tons of petitions out there are you aren't the only.

For the performance question:

Naturally Aspriated (no turbos/superchargers/NOS) the cheapest and best all around gain is:

-Injen CAI (intake, submerging the filter will cause the engine to seize, that is very rare, however)
-Hondata (ECU upgrade to change VTEC points, redline, etc.)
-DC5R rear sway bar (virtually elimates understeer)
-Race Headers (illegal becuse there won't be a cat conv.)
-Springs (tons of them out there with different heights and stuff)
-Hondata Intake Manifold Gasket (cheap and give a little bit of a gain)

Exhausts on the RSX will only really give looks and sound differences, not performance

Turbo:
Two major kits out there, GReddy and Cybernations. The GReddy isn't upgradeable, the Cybernations is upgradable to 700whp should you be that daring/insane. Get the Cybernations as it is slightly more expensive but offers a lot more expandability and customization.

Supercharger:
Jackson Racing is the only one with a SC for the RSX so far, although in less than a month we should see the Comptech (which will be warrantied by Acura if the dealer does it).

Get a turbo as its more expandability, much cheaper for the power, and as long as you don't put a jillion pounds of boost, it'll be about as reliable as a SC.