Alright, thanks guys. I'll use 8 awg. I'm trying not to get TOO big only because I just plan on tucking the wires under the molding in the center console - and if you get too many wires running under it the flap bulges out a bit...
One LAAAAST question: I've got two 12V rocker switches set up for the carputer and the amp in the center console, through which I'll run the positive wires. If I use 4 AWG wire, would that be big enough to use one wire as the 12 volt source for BOTH the amp and the carputer from the battery, and split it to two 8 awg wires just before the rocker switches, to keep it neat? I'll use this where it splits:
http://www.radioshack.com/product/in...entPage=family