I would give the SVS a shot. My personal experience with Supercube subwoofers has been less than inspiring (much like the Sunfire True subwoofers, these things put out lots of uncontrolled bass). I would view them as "floppy" compared to the likes of the HSU STF-2 I once had. HSU and SVS seem to run in the same breath around here, so it's reasonable to assume their quality is very similar. Basic word around the campfire is the HSUs are better for music and the SVS are better for overall output. The SVS SB12 plus may be an exeption to the rule as it's not a ported subwoofer (which hurts the extension) but more than likely has tighter bass handling, unlike Def Tech super cubes.