i've posted stuff in prior page
IMO get a single 12, sealed box (you can get a 10 inch and save some cash)

Good brands:
Sundown
AudioQue
Skar Audio
Kenwood (highend)
Memphis
Incriminator Audio

i've had kicker CVRs personally think the best buy duals in the bandpass where better LOL, kicker is far from SQ
JL you pay a arm and leg for, MTX is like kicker in my books, Alpine is ok IMO you pay more for the name, I've heard good things about Polk never heard any in person though