If you do not hear any discontinuity between your L/C/R, then I would aim for sub if you can not shake the bug.

Would you happen to be in the Los Angeles area? I know someone that is going back to two channel, and is selling his extra pair of CBM-170's and a CMT-340c, as well as a STF-2. I actually have dibs on the sub...but I do not need it that bad.

-curtis