In alpabetical order; ACI(Audio Concepts International) Hsu Rockets SVS Velodyne Considering everything that's coming down the pike with each of these manufacturers, I'm betting that combined, they're gonna suck up over 80% of online sales. For sealed choices, you've got ACI, upcoming Rockets, and Velodyne. For vented, you've got Hsu and SVS. Whether you're looking for particular features, aesthetics, sheer volume, tightness, accuracy, etc., these companies seem to be on the right path toward really fulfilling customer needs. Should be a REALLY interesting year. Randy ps- The only regular-distribution manufacturer(Velodyne) was included because they also have a very good reputation(although pricey) and are coming out with new "direct drive" digital subs with automatic room eq. that you'll be able to visualize on your tv...should be neato torpedo.