Thanks, guys! Here's where I'm at:
Bought:
Acer Laptop (1.3 Ghz Pentium M) - $345.01
Pac Audio SWI-X - $39.88 - steering wheel controls
BU 353 GPS dongle - $54.95 - amazing how many sats this baby picks up!
Maya EX5 - $59.95 - Dolby 5.1 surround via USB
Infinity REF96131 Speakers - $81.80 - blew my stock rear speakers, so I had to get some new ones. These are at least 5x better though.
GM Double Din 7" screen mount - $95.00 - humount.com
Left to get:
Xenarc 700TSV
Relay controllers?
Managed Power supply?
I'm as of now, I'm unsure how I'm gonna get the RCA plugs on the Maya to go to the speaker wire input of the stock Monsoon amp. I talked to a guy at Fry's who said there's no such thing as an RCA to speaker line in converter. I find that hard to believe, but we'll see how it goes.
Also, at this point I'm not sure if I even need managed power. I can wire both the screen and the laptop directly to the battery by hacking their cigarette lighter adapters. The only thing I would need less than 12V for is externally powered USB devices (right now I don't have any) and perhaps a power signal for the amp. My biggest concern right now, is getting the sound from the computer to the amp, and getting power to the amp. It's gonna require some more research, but I'm a quick learner.
I also have to figure out how to get my computer to start up with the ignition, hibernate when I open the door, and stay on for 10 mins if I don't open the door while the car is off. Those are all functions of the Monsoon amp, but I just need to figure out how they (GM) made it do that.
A good site for Grand Am owners is
http://www.grandamgt.com/forum/.