I second the suggestion on the SVS SB12+. I had a pair of them and sold them to "upgrade" to a pair of ULS-15's. I've regretted the swap ever since. While the ULS-15's go lower, and louder, they can't match the SB12's smooth, quick, and musical presentation.
The ULS-15s are an excellent choice if you're looking for HT, but for music, the SB12 are highly recommended. They're between runs of the old and new design, but you should be able to find a used one under you budget.
The ULS-15s are an excellent choice if you're looking for HT, but for music, the SB12 are highly recommended. They're between runs of the old and new design, but you should be able to find a used one under you budget.