Subs from pretty much anyone other than DefTec, as none of their offerings are very good (nor is there any reason to match to brand of speakers). I'd look at probably no less than something like the RSL Speedwoofer10s, but there are a variety of good subs from Hsu, SVS, Rythmik, Monolith, and some others. Depends on budget but I'd generally keep to at least duals. How big a room do you have?