No, you're a nuthugger.
If you want 6 subs, and have 1500 rm to play with thats only 250 rms a peiece. Kickers lowest line of subs are rated about that and come in 15s. And would keep you at your budget.
http://www.audiosavings.com/products/15-Inch-Car-Subwoofer/NEW-KICKER-10C15-15-COMP-CAR-SUBWOOFER-C15-4-OHM-C154/10C154.aspx