Right now I'm running Boston CR-75's as mains with a Yamaha RX-V450 receiver, along with a velo ct-100 sub. Would the Polk R50 towers be an upgrade for me? I listen to alot of music and the polks seem more full. They are selling at a killer price now ($200/pr). I did some searching, but had a hard time making a decision as far as the quality level is concerned. I will mention that my room is like 12X15ish....so the room doesn't need towers.