as far as your set up goes, polk has always been and still is a very good brand with excellent performance. I like kenwood amps, and I think they are a best buy on a price/performance basis. If you have the space available, then a 2 ch amp per pair of speakers is a good way to go as you can control the power to the pairs better than if you go with a 4 ch of equal power. For the rears I would suggest a 2x100 kenwood or similar, and then look into a sub/amp set up to round it out...if additional bass is desired.

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2004 300M SPECIAL
Alpine CDA 9833
Alpine Pxa-h701
Alpine Rux-c701
Rockford fosgate p400-4
Rockford fosgate p4004
Hifonics BX 1205D
JBL c608 GTi
JBL p963
Infinity 2.5" center channel
Alpine type R 12"(2)
200 amp alternator
yellow top battery
0 awg power and ground (welding cable) 300 amp anl fuse
all active SQL set up with 2000 watts rms