What kind of power increase are you getting with heads and cam? Is it just as reliable?
Heads/cam/roller rockers will yeild around 100 rwhp. Depending on the tune, you may get less, or more. You also have to factor in driveability when considering the tune.
Reliable? I went this route over forced induction (supercharger). It always seemed to me that guys with a SC were always having tuning issues, pulley issues, and destoring a cylinder here and there due to detonation. Some may argue that a high lift cam will reduce engine longevity, but since my car is not a daily driver I was not concerned about that. So far I have 3,500 miles and with the exception of some PCM tuning issues, all is well. And the tuning issues are under light throttle/load conditions.