looking for advice on budget subwoofer


I have a budget system (rotel ra-932 integrated amp, B&W DM601 speakers, jealous?) and am looking to improve it a bit.

If anyone has advice on a budget subwoofer, or other ways to spend $300 or so to improve the system, I'd be curious to hear.

I just use the system to listen to music (no movies) mostly rock and jazz.

It is in a 12 x 12 room.

many thanks!
davidvan
http://www.audiogon.com/cgi-bin/cls.pl?homesubw&1319484164&/Yamaha-soavo-900sw-birch-new-a
I have a budget system I use in the winter, and I was able to get a Mirage subwoofer on sale for under $300, that is very musical. Vanns has the following subs marked down that are in your range:

Yamaha Soavo: $400 (retail was $1,400) - This would be my choice - 18hz!
Mirage MM8: $350 (retail was $800)
Velodyne SubContractor Series 12: $400 (retail was $800)
REL T3: $400 (retail was $600)

Hope this helps,
mot
One more. HSU Research has a sub on sale that fits in your range.

http://hsuresearch.com/products/stf-1.html

Mot