When I have bothered to put a stereo in a car, I always got the 12v power from the reverse light circuit. That way you don't have to run a wire to the battery, just to the fuse block, it's protected by a fuse, there is rarely any other draw on the circuit, and whenever I have done it the reverse lights were one of the constant power circuits (as in they stay on when you start the car), but the circuit will shut down when you turn off the key so you don't have to worry about leaving the stereo on and killing the battery.
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"Don't look for one place to lose 100 pounds, look for 1600 places to lose an ounce." - Tony DeFeo
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