Hi,
I use Kicker 57i's in the front doors. They are 5x7's with a tweeter that can be either coaxially mounted or located elsewhere with an external crossover. Tweeters swivel in mounts. Very nice speakers. Can be found for $175 online.
In the rear deck I have a pair of ADS 320is'. The mid/bass driver is mounted in the deck and the tweeters are mounted on the plastic panel btwn the rear seat and the door firing forward. The tweeters are soft dome which can be a plus in an automotive environment.
I suggest avoiding using the rear door locations altogether as the sound seems to get swallowed up back there by the seats and carpeting. At one time I had a pair of Infinity 5x7's in there and felt that I could've left the factory units in there and not noticed the difference.
Alpine TDA 7563 head unit
Alpine CHA S624 six disc changer (fits in glove box nicely!)
Kicker 57i's in front doors
ADS 320is' in rear deck
2 Soundstream D200's
