Here is what I do on my car:
I have the battery mounted in the stock location, and run an 8 guage wire straight to my big amp in the trunk. I then have a 10 guage wire running to a small fuse strip that has 6 or 7 spaces in it. I run my small amp, alarm, neon amp rack/trunk lights, my laser alarm light, and a couple of other things.
My only other lead from the battery is directly to the starter. You can really make it clean using terminators. Check www.cruthcfield.com
. They have all the wiring stuff you could ever need. Another thing to consider is the draw on your battery. If I turn my car off, the stereo will DRAIN the battery in 5 minutes or less. That is with a Diehard Gold hi amp battery. Eventually I will go with a yellow top optima in the trunk and a relay to the main battery to allow the batteries to charge each other if I get in a jam. It will also make running the wiring very simple. Hope this helped
67 Pro-touring Camaro-327, 9:1, Comp XE268 Cam, Perf. RPM Intake. 750 Holley, Sportsman II Heads, Ceramic coated headers, 700R4 trans, 17" Amer. Racing TT2's, 12" disc brakes, custom stereo, black with white stripes, cowl ind. hood.