For a small footprint, the PC12-Plus looks like it would do well. I don't know where you are going to get more output for the floor space, that thing has a 17" diameter footprint. I think the SVS SB13 Ultra would probably be better for the OP's purposes, its footprint is slightly larger, but it is more expensive, of course. I would be looking at the Hsu ULS-15 mk2, which is an 18" cube, that will certainly hit harder in the music ranges, 40 Hz+, and it is less expensive. It also looks nicer than a water heater.