Again, I have to emphasize that I've not heard the M60 or M80, but the M22s plus a good sub give me all that I want in musical enjoyment. The all-important mid-range in particular is outstanding for clarity, and as you note, it has two of the 5 1/4" drivers, while the M60 uses one there.

Yes, the Dutoit is one of the six versions of The Planets that I own, and it's excellent, but the Mehta(L.A. Phil)is my overall favorite and in second place I'd probably put Levi.

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Enjoy the music, not the equipment.