I am hoping M60's will do an adequate job as fronts.
There is no question that the M60 can fill that space with sound given proper amplification, so I guess you are asking if you have enough amp. The answer to that depends on your objectives.
How loud do you like to listen? How far away from the speakers are you going to be when listening? Listening at reference levels (loud) in your kitchen (which I assume is the farthest point from the speakers) is going to take a lot more power than listening at the same volume 10' away from the speakers.
Given that the M80 is more sensitive than the M60 and draws a 4Ohm load, it will play
slightly louder than the M60.
Both the M60 and M80 are quite sensitive, so are good choices for limited power situations.
