500$ budget for new amp and sub

[Bots1028]

I got 3-10's mtx 6000 in custom box and a fosgate 500a2 or bd500 for you

[Full Tilt]

SKAR Audio makes virtually any custom enclosure for $125. I'd pick up an SA-12 or SA-15, and then get a good deal on a used amp. You'll be slamming in no time.