I am running a 100 watt yamaha receiver with monitor 30 mains, a polk monitor cs1 center speaker and a velodyne vx10 subwoofer. I just purchased a pair of polk rc60i ceiling speakers that I will install as my rear surrounds. Can anyone tell me if they have this set-up, and how it sounds in a room that is approx. 20x20. Are the RC60s a good match with the other monitor speakers? Thanks for any advice.