FWIW - Given the size of your listening area, I think you're making the right decision for your situation. I haven't personally heard the M60's, but I know from reading here and many other places that they are held in very high regard. I look forward to hearing how your M60's sound with the 805.

A: Epic 80 * 600 / Integra DTC-9.8 / A1400-8
V: Samsung HL-S6187W / Tosh HD-XA2 / PS3 / Oppo 970HD