Sub Recommendation to handle both music and movies

Hi all,

I'm looking to add a sub to my system which consists of a pair of Vandersteen 2Ci speakers. I would like to get something that would be good for both two-channel music and also would be good for movies. My room is 2700 cubic feet.

My budget is around 700.00, I see a lot of different brands out there (Velodyne, HSU, SVS, Rythmik, etc.) and wanted to get your take on what your recommendations would be.

Thanks,

Ed