that's a decent amp. you have plenty of clean power available to have a good sounding system.
don't blow it with 6x9s. for one they don't fit 2) they would likely cause your doors to rattle 3) you don't need 5 supertweeters on anything that's just silly..
I suggest you buy your self a low priced set of component speakers (just one set), and a basic subwoofer+box.
Amazon.com: Phoenix Gold RSD6.5CS 6.5" Radial SD Series 2-way Component System: Automotive
Amazon.com: Atrend E12S B Box Series 12-Inch Single Hatchback Enclosures: Car Electronics
then add your choice of low power handling sub..
example R1S410 - Rockford Fosgate PRIME 10" Single 4 ohms R1 Series Subwoofer
You obviously seem to want more bass... the speakers I abouve are a perfect starter set, they are known for their massive midbass output and clean highs. a sub will pickup where those leave off. forget about the rear speakers. I guarantee the above setup will louder and better sounding then just putting 4 new regular speakers in.
you will absolutely need to figure out how to set gains and crossovers on your amp...
Amplifier Gain Controls
Toreador Red 05' FX4
4.0 4x4 A/Tran Ext.Cab Daily Driver. Nomads, BFG M/T's
Alpine 9857, JBL MS-8 DSP, US Acoustics 2x80w & 2x100w, Vifa 1" XT25 Dual Ring Radiator Tweeters 3k+ 24db slope, Dayton Audio 7" RS180-4 Mid-woofers 100Hz-3k 24db slope, 500w rms Kenwood Class-D Mono - JBL 10" GTO1014 Sealed. 100Hz- 12db slope