In that room size you most likely will not be listening at levels that will require gobs of power and it won't take gobs of power to blow you out of the room. \:\) Don't rule the 60's out either, they used to fill my 900sq ft room just fine with the Denon alone and no extra amps.

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