Not knowing how much you want to spend I would recommend the MIT 770's that are on sale at Audio Advisor. (I don't work for them)A friend just bought them(upgraded from the 750's ) and he thought that they made such an improvement on his Thiel CS 6's that he is now looking to sell his Genesis 900 subwoofer. Even a used set of 750's Series ll would make a nice improvement.If you can afford $1200 you can't go wrong with the 770's. Good Luck!
