Meh on caps... You are going to need to some serious power to support that 3kw amp(I think that is hifonics new line the supposedly does rated, IDK though). Big amps on weak electrical systems is always risky.

As for wiring, I have had solid luck with Rockford, Stinger, and KnuKonceptz. Don't skimp on wiring. You'll find yourself just upgrading later on. Do a solid run of 1/0(true) to the back and add a batt back there when you get a chance. Keep the gain low until you get a chance to get a second batt in. It is really east to introduce clipping on a stock electrical system.