Some say there is a difference in sound between the two (they often are M80s owners ). Others maintain, as you stated, the difference is minimal (they are often M60s owners ). I think, in a room that size, you don't "need" the M80s, but don't think they necessarily would be "overkill." The 3805 would work with either speaker. I say....................get the M60s and put the difference into other equipment. (Just my opinion)

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton