My fav is the Memphis Mojo. It gets loud off rated power and can handle way more power, a little bigger box with a low tune makes it sound great and not sloppy and if you manage to mess one up swopping out the cartridge can be done in a few minutes.
Subs I have owned - 12" RF punch Z, 12" RF HE2, 12" MTX 5500, 10" & 12" RE SE, 10" & 12" RE SX, 15" RE XXX, 12" RE MX, 15" RE MT, 12" JL W7, DD 1008, DD9515f, 15" AudioQue HD3, 12" SI Mag, 10" & 12" Sundown SD1, 12" & 15" Memphis Mojo, 15" new Memphis Mojo, 10" Treo TSi, 12" Treo SSX, 10", 12", and 18" Treo SSi