Just wanted to add my 2cents to this conversation. When I first bought my M60's I really wanted the M80's but didn't want to wait any longer to save a bit more. So I bought the 60's. As much as I enjoyed them I always felt I should have gotten the M80's. Finally a few weeks ago I decided to buy the 80's. In the end it's costing me more as I am taking a loss on the sale of the 60's.
I now save up for exactly what I want rather than regretting what I settled for. It gets too expensive in this home theatre hobby.
Now that I think about it the same thing happened with my receiver which I bought at the same time as my 60's.
M22's v3, 2 x EP500v3, VP150v3, QS4's, Denon 3808CI
My Botswana Safari photos http://smu.gs/R41Byt