Hi and welcome golfguy. I wouldn't consider it overkill at all if you like to 'turn it up' occasionally. I have an Epic 80 / EP500 in a smaller area than that, and love it. The M60's are an easy load for any quality receiver you choose to drive. Just choose the bells and whistles you like and go with it!

Epic 80 / SVS PB13 Ultra
Denon 3805 / M2200 Outlaw Monos /
Sammy 55" LED