okay this is what your car has room for from the factory
Front speakers
Front Door: 6-3/4"
Far rear speakers
Rear Seat Side Panels: 6x9"
If it was my money this is how i would spend it.
Deck -
Alpine CDE-9881 CD Players,MP3 CD Player
front doors -
Phoenix Gold RSd6.5 Car Speakers
Sub amp-
MTX XThunder 600XD Amp: Mono
sub (as in one) -
Cerwin Vega VMAX 12.4 Subwoofers
Total price = $559.90 not including tax and shipping.
but i could do this a hundred times over.... on that one site.... forget about the rears... run the fronts off the deck.... This would make what you had picked sound like a garbage can rolling down a tin hill... you are far better off having a few really good things then a bunch of over rated junk

and just have a box built for the sub i can tell you this sub loves a 2.15 slot ported box... i know i used to have one and it was great
or if you have brands you like more then others i could build by brand.