I agree with the poster above. I have this sunfire sub
http://www.sunfire.com/TrueSubwooferEQPR.htm
And think it is brilliant. I have owned Velodyne, Rel, MJ acoustic, Kef, etc sub's so I have some idea of what a good sub sounds like.
I now have a MJ Acoustics in the cinema room (cause of easy PC connection too!) and Sunfire in living room
I got mine for I think £600 or so whatever it was it was an absolute bargain (from eBay).
For everything I was looking for it was the best all round.
1) Bass quality
2) Price
3) Size (needed to be reasonably small)
4) Aesthetics
5) Build quality
6) Connection flexibility
Now for all the above this came out top! For Bass Quality the Velodyne I owned just pipped it (just). For size though can't really beat the Rel Quake! Build quality and connection flexibility on the MJ Acoustics is also good. Aesthetics's, Kef were nice, etc, etc but all round this is the best subwoofer for me.
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