Heads up, those coaxial units I listed above, have a broken tweeter stem. If you go the pioneer route (and at this price, I definitely would) get these for the front and the rear.
$99 a set
Pioneer TS-Z65C 6.5" Component Speaker System 300 Watts Max RB | eBay
1-1/8" aluminum tweeter. 6-1/2" Twaron fiber woofer with butyl rubber surround. Tweeter Composition Aluminum. Woofer Composition Twaron. Woofer Surround ---. handles up to 100 watts RMS (300 watts peak power).
$99 a set