polk paradigm denon

Looking for a brand new 5.1 surround system. My living room is 17' deep, and 25' wide. I need the works; receiver, speakers, sub. So far I am considering going with Polk, what do you think of this setup? Denon AVR-X2100 Polk RTI A1 (fronts) Polk CSI A4 (center) Polk 620 RT (rear ceiling)...