Another sub to consider - The PSB SubSonic 5. (or 6).
I have M22s / VP150 and Q4s, and a Denon 2802. The PSB Subsonic 5 works very well with those.
My HT room is 19.5 by 15.5 with 8 foot ceiling; carpeted; more or less " hard furniture" and floor to ceiling
vertical cloth covered metal vertical blinds on the back wall. I have a "crawl space" below the room that slopes in height from 2 feet to 15 feet (on a hillside) and acts like a sounding board. To solve the boominess I have the sub sitting on a 1/2 inch 15 x 15 inch slate. This really tightened things up and although the woofer is only 10 inches, the bass drops to 27 Hz with all the volume I would ever need.
Check it out at http://www.psbspeakers.com/s/Subwoofers2.html
