Don't bother camming an RB20 unless your making BIG power (300 rwkw+). Also if you are going to cam, go custom, don't bother with PON Cams - they're poorly made and I've heard loads of troublesome tales about camming the rb20 with Tomei Pon Cams.
If you want good power gains on your RB20 slap on a Z32 AFM, FMIC, Bigger turbo, bigger injectors, bigger fuel pump, full exhaust, plazmaman plenum and a 6boost turbo manifold. I'm waiting on the plenum and turbo manifold to go in and I should see 280rwkw