Any of you running stereo subs in your 2 channel system? If yes and you had $2000 to spend on a new pair of subs, what would you buy? Have been looking at Hsu ULS-15 MK2 and SVS SB-2000 subs. My 2 channel system currently consists of a Mac Mini playing lossless files, Rogue Audio Perseus preamp, Vincent SP-331 amp and KEF LS50 speakers. The LS50s sound great, but need some reinforcement below 50 Hz.