If you really wanted to do this, getting 3 more M60's Itotal of 5) and using them as front, center, and rear surrounds for SACD and DVD-A listening, and using your existing QS's as side surrounds for movies makes the most sense to me. You could power the 5 M60's with your mm9000, and use your receiver (or a cheap stereo power amp) to drive the side surrounds. I doubt whether you could improve on this setup much.

Mark

"Shoot, a fella could have a pretty good weekend in Vegas with all that stuff"