sub for $3500 or less

started this thread in the home theatre section, but maybe better suited for the speaker forum. just got a great tv and looking for the "super" sub...i'm only running 2 channel and the sub would be for movies...i'm very pleased with my system so far and believe that a bad a** sub is long over due...i very much enjoy movie night...budget is $3500 or less and would appreciate any advice from my fellow audiogon comrads... thanks, brent