My HT/Rec room is 900 Sq Ft, much bigger than yours. I had m60's down there for 3 years, love them, and miss them a lot. I currently have 80's. Yes they are a bit better overall, and the extra power handling, most people would never play it that loud to notice a difference.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85