Plans include.

-All Alpine system (my old car had one and I'm in love with alpines qualit of sound)
-1 300-500RMS amp powering 1 10 or 12" DVC woofer
-4ch amp powering front and rear speakers
maybe a few lil extras, possibly a dolby digital processor in the future, we'll have to see though :P

I havent had a chance to take apart the wall behind the seats to see what kinda of speakers are there or how much room is there. The sub encloser i will get will be fiberglass to use as little space as possible, and if it can actually be mounted within that wall behind the seats that would be pretty cool. But I can't say for sure where its all gonna be before i get the car apart to look at the space available.

Thanks for your help.

Tim