12's N/A daily driven is going to be tough, unless your car is in the sub 1800lb range. If you're talking 12's with nitrous, that won't be too hard to do. If you're talking just on the motor, you'd have to run super high compression, and huge cams. Flat valves do exactly what you said, raise compression a tad. I would get something stainless, maybe with a heat coating for use under nitrous. Going 1mm over isn't a big difference. I wouldn't rev it to 9000 with stock rod bolts, but that's me.

Good port jobs aren't cheap, but you definitely want a respected person porting your head...portflow, alaniz, etc. The cam you get depends on what you're looking for. Nitrous loves big N/A cams, so you're in a good situation there. Toda, Crower, Skunk2, Jun, all make good N/A cams. Try to find dyno charts comparing them, or at least between them and a stock cam, so you can see where they make power. Check out www.importreview.com for some good cam dyno comparisons. Also, don't try and run something as extreme as Skunk stage 3's on a daily driven setup, or they'll eat up your rockers. It's pretty much a race grind cam.