i emailed the polk audio people asking what would be best and a lady contacted me saying to try and get a 7.1 that offers atleast 100 watts per channel and bi amp capability. onkyo, denon, yamaha, harmon karden is what she said. you can bi amp the main ones which would be my tower towers getting more power to them. not sure if its worth it. any ideas? or should i just say screw it and go with 5.1?