Either one will be a nice upgrade from what you're using. I have the M60's (V1) & love them. They beat, by a long ways, anything I could've gotten for $800 from a B&M. If I had to critique them, I'd start with the fact that they can be bright if driven with a weak amp/receiver. I started with a Yamaha RX-V620, went to a RX-V3300 (now my pre), & now with a B&K 7250-II. Each step up warmed the sound of these speakers. They will throw some bass if fed sufficient power, but I wouldn't say it's a strong point. It's good..........not great.
On the plus side, their clarity & imaging is excellent. I use mine as my fronts in my HT setup (M22's for rears, VP-100 CC) & when listening to music, I can turn off my CC & the vocals are centered superbly. I have a room similar to yours (15 X 24) that is pretty bad acoustically. The only "treatment" I have are the drapes over the windows (& carpet). Still, at moderately loud levels, this setup sounds pretty damn good.
I've never heard the Monitor 11's so I can't comment on them. But from what I've read they're very nice.
