subwoofer suggestions

I am using an SVS Sub Ultra 13 with a pair of Monitor Audio Gx200 and GXC350 as a centre. The SVS is excellent, deep and weighty with lots of slam. I am so happy with the SVS, that I am going to but another!
I will probably also invest in a DS Peaker 8033 to streamline the sound on the SVS pair even more.

Apex sub is very tight and fast. You also can consider the new MA sub from the latest silver series. Always buy a closed front side subwoofer. Better timing and better integration.

You should check out the Seaton Submersive subs. I heard they are the ultimate subs for movies and music.

I would try the Svs SB13 Ultra. Amazing reviews (5 stars) across the board. In your price range. I have the PB 13 Ultra and it's the best I've heard out there and in my city stores. Too big for your room. Svs is the best to deal with......45 day trial. Check it out at Svsound.com. Really....

Update, I really liked the SB 1000s, but they did not go deep enough for movies in my room. Terrific on music and I liked the high level inputs for analog sources. Build quality was better than expected for the money. SVS took them back and refunded my money without question. Have to love that company. I seriously considered getting one SB13 Ultra instead of two SB 1000s, but wanted high level inputs. It also weighs 90lbs.

I ended up with a b&w PV1D. It has both high and line level inputs, and once set up properly it is fast and tight for music and makes sufficiently terrifying sound pressure in my room for movies. It is still breaking in, but am very happy for now. One interesting note, with no low frequency cut off, the rumble generated on some vinyl recordings can be quite something!