It's gonna be hard to get RSX handling with $900. I'm assuming $900 from $400 15" wheels and $300 for tires plus $200 bars. You should be able to get Prokits and AGXs for about $600.By Nature said:
What I'd recommend is GCs and AGXs for about $800 and then only lowering the car about an inch at most. Otherwise, if your budget is actually only $600, then get the AGXs and swaybars. Prokits really suck for shitty roads, and you'll be happier with the better damping plus reduced body roll. This way, you could always upgrade to GCs later for $400 and not have wasted $$ on crappy springs.
-Scott