Your best bet is to have a read on ClubRSX mate, there are a lot of cam'd RSX's on there. You have to remember that most people don't go with cams unless they already have uprated the air intake, ecu, manifold and exhaust system, which isn't cheap.
IPS K2's seem popular as do Toda N2's (which I'm having fitted to my CTR early in the new year).
Toda have recently released A3 cams which give slightly better results than N2's, so should be about on terms with IPS K2's, perhaps slighty more power, but without the louder valvetrain.
Does anyone know why in the US they all fit titanium retainers, yet in the UK no one mentions it??? Even on kits like the N2 Engine kit they still use these??? Just wondering if it's worth important some for when I have mine fitted.