Cam Help!

I have a new motor in the works right now, and i need help selecting a cam and roller rockers. These are the specs for the motor as of now.
-Stock block .30 over
-DSS 306 pro lite rods and flat top, fly cut pistons
-Ported E7's w/ 3 angle valve job (all i can afford right now)
-Ported/port matched stock intake manifold. (all i can afford right now)
-All the other crap in my sig
So i need a cam? i dont quite know how to find the best match for this setup. i am obviously leaving room for improvement with the heads and intake, but not in the very near future. so i need a cam to work good for now! I dont have the money for a custom grind so im stuck with off the shelf cams right now. Im thinkin either the E or B303, steeda # 18 or 19, or the crane cams powermax 2031. Any suggestions would be awesome.....thanks guys

I will be doing the porting on the intake.....i have an entire machine shop at my disposal....but i think i will be having the local engine builder doing the heads. I am running 3.73's. thanks a lot for the help and suggestions. i think im going to research that extreme comp cam a little more now....looks like it has higher lift than either of the other two. how does your steeda cam run? did u notice a big drop in low rpm torque? where does the power really start comming on? thanks again for your help!