I've heard both the m50's and m60's. Not back to back though. Both very good speakers. I own the 50's and couldn't be happier. The 60's seemed much clearer/crisp to my ear. I liked the sound and even considered upgrading. However what convinced me was how hard my buddy had to drive his sub to make up for those crisp highs. I live in an apartment and really can't have my sub blastin like that. If You have a well insulated room or don't need to worry about the neighbors go with the 60's. I think they will match up better with the rest of the speakers your looking at also.

Also have the 2805. Looked at the yammie but just liked the denon features.

Have fun with the search
Leaf