There are a lot of great subs out there. I use Rythmiks (they pair wonderfully with little Maggie panels), but SVS, HSU, and several others are also well regarded. I'd only offer a couple of general thoughts you might want to consider.
Think of "tight" rather than "fast" bass. IMO, You'll get to the same end and save yourself some headaches of mis-communication along the way. Tighter bass may or may not be better for your system/taste, but at least it makes sense conceptually.
Integration of subs can be executed in several different ways and may affect your choice of subwoofer. If you use room correction software, you may end up happy with a single, high quality subwoofer. If you use a more traditional, non-EQ approach, I'd think hard about Duke's multi-sub, distributed bass advice.
Good Luck
Marty
Think of "tight" rather than "fast" bass. IMO, You'll get to the same end and save yourself some headaches of mis-communication along the way. Tighter bass may or may not be better for your system/taste, but at least it makes sense conceptually.
Integration of subs can be executed in several different ways and may affect your choice of subwoofer. If you use room correction software, you may end up happy with a single, high quality subwoofer. If you use a more traditional, non-EQ approach, I'd think hard about Duke's multi-sub, distributed bass advice.
Good Luck
Marty