Velodyne definitely makes some good subs. I was all set on purchasing one until I stumbled across SVS. I think that for Vel to compete you have to spend 1500 or more though. For HT I believe the best bang for the buck is the PB21SD. For 899 it is an unbelievable value. And seeing as we are on the Axiom board don't rule out their subs. They have a smaller footprint and come in some great finishes for the WAF if it applies. While they won't extend as low as SVS they will still blow your old sub away and if buying them as part of a system you can save a few additional bucks on it to boot.