You can't go wrong with the usual suspects, Hsu, SVS, eD. I see Outlaw has a new sub with an 8" driver which is available as a dual driver system, that should be an interesting one.

http://www.outlawaudio.com/products/m8.html


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70