I have had a Velodyne VLF-810 for a few years and found it to be an excellent sub for the money. It's not one-note bass like alot of subs--very tuneful and musical. Not as much slam as some, but sounds far better than others in it's price range. Good internal amplifier, clean power. I'd look at some current Velodynes.
Mine will be going up on a'gon if a fellow TS member doesn't buy it soon
A friend of mine has a Klipsch that is killer for movies--terrible for music, but for movies it's killer. Not sure how much it was, but if you're more movie-oriented you could look at their stuff.