With a room that size, a larger speaker will provide higher SPL overall, but if you do not require high sound volumes, stick with the M60s.
If you do not want heavier bass, then the EP350 should be fine, unless of course you want to hear the bass 20 feet away.
At 10-12 foot typical listening distance, even the EP175 would work, but it seems that people never sit in one location while that stereo plays. Inevitably you head into the kitchen to do some cooking and want to hear the music...


"Those who preach the myths of audio are ignorant of truth."