Help choosing a new Subwoofer

[sarge1976]

I have all klipsch speakers in my HT so i was looking for a klipsch sub to match them, then a buddy of mine was telling me to look at velodyne because he has one and swears you get more boom for your buck, I really haven't heard too much about the brands you meantioned,nothing against them but there aren't alot of HT stores where i live to experience a range of different subs from different companies,pretty much just the usual suspects.