I would choose the wide speaker option or M60s.
You won't really notice much in a difference of M60 vs M80 except in the lower end which the subs can be used for easy correction.
What's the point in paying more?
Our media room could easily fit the M80s, but i never saw the point. A bigger speaker in a smaller room is actually harder to place to adjust in making a good stereo image and soundstage. Smaller speakers have way more flexibility for placement (although the M60s won't add much of a benefit in size regard over the M80 except mostly for height and a bit of depth).
