Yep...your room is a bit on the small side for a pair of M60's. I'd throw a pair of M22ti's or even the M3ti in there - pair them up with a nice sub. (Dare I suggest the Hsu VTF-2 again?)
Normally I highly recommend the M22ti, but if you listen to a lot of Pop and Rock, the M3ti may be better suited for you. The M22ti is SUPER clear and accurate - an amazing speaker for well recorded, well engineered music, but not forgiving at all of poorly recorded music, which unfortunately many Pop and Rock albums are.
