Going for cheap factor here would be headers, intake, pulley drop. It will be cheaper than doing a IC setup and with having the flow from the headers it greatly reduces the chance of KR. I'm sure some disagree about always doing headers, but for my own sake, I like to know that I have all the exhaust flow I could ever need.

Rockers don't give you enough for the money, personally its a waste of money to me for a very little power increase in the upper rpm range.