I have owned M80's for a few years now and have tried them in several rooms, and I have to be honest with you, they do not sound good in a room 12 x 10. I have had them in a room almost exactly those dimensions, and there just no soundstage. The sound was like... like it was put through a blender.
I had M22's in that same room, and M3's, and they both sounded very good. I would suggest either of those, or M50's if you want more bass.
However, if you plan on having a bigger room shortly, then you can definitely get M80's. Also, don't forget that if you get M80's, you will need an amp that can drive the 4 ohm load.
