I've been through a few subs; Paradigm, B&W, Defenative Tech, Infinty, etc. and never could find one I really liked for music and HT. That is until I took a chance and ordered a SVS 20-39PCi. All I can say is wow, what a great sub. My wife hates it because it looks like a big industrial tube with black carpeting on it. Not pretty, but hare to beat dollar for dollar IMO.
Subwoofer recommendation
Looking for a subwoofer to go with a pair of Coincident Triumph Signatures. Got the speakers when I had a pair of Rogue M-120's but had to sell because of a move and space. Now I pretty much use them for movies, but would like to up the bass with a sub. Looking for something in the $500 range.