What other mods have you done to you h22a? i wouldnt recomment cams if you havent done the following-
*Header
*intake
*intake manifold
*exhaust system
*electronic managment
Because you wouldnt get the full benifits of an aggressive cam profile with out these.
However, sayin youve got them or you just wana go ahead and fit them any way.......
Stage 2 should be fine from most companys...skunk2 stage 2 are a good set of cams and have a very good power curve.
You will need, valve springs, retainers and if you havent got it already, again to feel the full benifit you will need some sort of elec managment (hondata, crome, uberdata etc) becoz you'll probs find your max power will be at a higher rpm with the new cam profile.