If you want really loud just get some MMATS subs and amps. :mullet:
It all depends on what you want, and it really seems like you want a LOT of bass. For (6) 12" woofers, you could get less powerful subs and still hit really hard.
$3200 for wheels, and 6 woofers, and also amps? That's actually not as much money as you think for what you're trying to buy. I'd suggest either buying wheels, or buy the subs/amps.