[Accord Man]

You should go with a sealed box. Takes up less space & is usually better suited for tighter(rock/alt) bass.

from Ikesound
amp : KAC-8101D (135$)
sub : 12" Alpine R (the dual 4ohm model) (99$)

Sounds good?

When installing it, you'll need to adjust the gain carefully cause the amp is a little more powerful than the sub...