The best sub I've ever heard was the jl audio gotham. Musical, acurate, fast, goes as low 15hz, and has as much slam as a concert at a coliseum. Probably a fathom 113 would do the job right but if you want overkill the gotham is the way to go!
Best Big Sub? or duals?
I just moved and my HT is a 25 x 30' room in the basement with concreat floors. My current sub a vandersteen is to musical and just not big enought to have any effects, I also have a 15" velodyne that just about cuts it but doesn't really shake the room and the sweet pot is to narrow, probably because of lack of power my old house this did great in. I am using all vandersteen speakers so they are really fast I need a good fast sub or two that will shake the room. Any sugestions cost is not a big issue just want to do it right and don't want to spend more than I have to.