Truck cut through set-up.

[Chevy4u]

Aight I'm doing a cut through on a 95 Chevy 1500 ext. cab. Thinking about doing 2 Btl 15's. A 260 amp iraggi alternator? (do I need more amps?) An SAZ 4500d amp, Focal polyglass 165 VR 6.5's in the doors, those being run by a SAX 125.2 amp. As far as a eletrical wise, do I need another battery or two? I have a stock duralast that I've gotten in the past six months. Also I'm not doing SPL or anything. It's just a daily driver for a basshead.