how big is the room? how far do you have them from the wall? how far apart are they?

please let us know because this may be a good example of why users shouldn't always go for the bigger_is_better speaker.
i still say that the m80s should be designated as (primarily) stereo use while the m60s should be more sufficient for HT use. IMHO

you could contrast this to paradigm users. i know a lot of paradigm users who prefer the studio 60s for home theater and the studio 100s for stereo use.