Jon, here's another idea - HKTS12, which got a rave on CNET, is at J&R for about $300 plus shipping. I've got the setup in a real big room, and it sounds very good to my ears, both music and movies.
Only downside is it's weak at low volume. So I just keep the volume up!
Mike, with relatively little for me to compare to, it sounds good to my ears. As the speakers are relatively small, it helps push the music to sound more full-- I opened up the crosover a bit higher than 80 (I think 120) to take a bit more low end thru the sub. At low volumes, I can feel the rumble through most of the house. I suspect it wouldn't fare well in competition against other subs for the deepest LFE, as its range doesn't go down as low on frequency as some others talked about here. But it does a heck of a lot better than no sub!
Overall, the set fills up a big space (24x24 with cathedral ceiling) very well, for me anyway.
If I hadn't been happy with this setup, my next option was Fluance and finding a sub to go with it.