[greenhorn]

in the end , the SQ of your setup depends on
1) quality of the speakers
2) quality of the install
3) quality of the electronics
and in that order, so you're better off getting good speakers and average electronics than average speakers and good electronics

Even among speakers , You'll be listening to the fronts mostly, so 12k for the fronts. the rears are there only for rear fill. you can get either 6x9, or in this case since you're getting a sub anyway, 6.5" coax speakers, and sound from them isn't as important.

I would also suggest you set apart a fair amount for damping.