If it were me, I'd bypass the M50's altogether and go straight for the M60's. I haven't heard them, but they look like it was designed for people that don't like any high end. But it might be just right for you and your room situation. You don't hear much about the M50's here, so there might be a reason for that.

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing