Re: Need help picking either 6x9 or 6 1/2 rear speakers.
Instead of spending the money on front speakers, back speakers, and enclosures... I highly recommend getting a set of component speakers for the front that can handle a decent amount of power. Loud comps up front > coax's all around. I've had the exact same highs setup that you are preparing to go with.... and I now have what I am suggesting. Believe me when I say it is a HUGE step up in volume, clarity, and imaging.
Rockford Fosgate t800.4, CDT ES-MO 6 mids, Digital Designs T2 tweets
2 MB Quart DSC1500.1's strapped on 1 Tantric HDD 12
Mike Singer 310 amp 6 phase
2 runs of Monster Cable 1/0