Seems to me you don't even have a header yet (unless you failed to mention it). I'd get a nice middle of the road or high end header/exhaust 1st, or you're just gonna be pissing in the wind w/ cams.

ALSO - after the exhaust I'd get a 50 (dry) or 75 (wet) shot and then call it a day until u build something else. Save the cam $$ for your new build. The gas + header/exhaust will be PLENTY of fun until you get that built.