I should have my car soon, maybe like a month or so. I have been entertaining myself during the long wait by contemplating stereo ideas, and here's what I have come up with:

Pioneer DEH-P940MP (the Premier version of the 9400mp)

JL 300/4 amp, running:
JL XR650-cs 2 way components
JL VR650-cx coaxials for rear fill

JL 500/1 amp, running:
JL 10w7 in either a driver's side rear corner fiberglass box (like the zland box) or an under-the-strut-bar box (like Nazar's design, but deeper to allow for the big *** motor structure of the 10w7).

Amps will be installed in factory sub space on a custom rack.
I will be running two 4awg power lines for the amps.

Any thoughts on this?

 

Here's my comments on each:

HU - if it's your bag of tea go for it.
Component amp: great choice
Sub amp: great choice
front speakers: decent choice - they sound good and for the money are hard to beat
rear speakers: why???
sub: w7s are nice speakers although are very heavy and are power hungry mosters - your 500/1 really won't be enough for it

Overall I'd say you have a good build although I still question why anyone would want rear fill in a Z. I say take the money for the rear speakers, drop that towards better fronts and reap the rewards.