[BluEyes]

If you're not going to keep the engine that long, I'd leave the heads alone. They do not have to come off to swap intakes, so just leave them be.
IF you were to do headwork though, I'd have a bowl blend done, install larger valves, shave the heads, and then re-work the rest of the runners slightly (in that order) Have a pro do the headwork though unless you know what you're doing - it is easy to lose power with badly done headwork! This all gets real expensive real fast though, so might be best to save the $$$ for a motor you plan to keep around awhile.
Also, with a new cam, keep in mind to not go too big on stock compression. You'll end up killing your lowend. I really wouldn't go a step or two above stock without adding significantly to the comression. Follow the cam-makers reccomendations for cam selection and you should be safe.