Partial system: Denon AVR 2803 Denon 2900 NHT super zeroes front, and sides, and rears. Matching NHT center. I recently purchased a used pair of NHT Super Two towers which will are a sonic match for the zeroes and center. My 2803 is rated by Denon at 90watts channel. Should I consider getting a two channel amp to drive the towers? I'm open to any suggestions, and possible amp suggestions as well. I'm not adverse to going used, as the only piece of equipment I have bought new is the 2803. Price range would be $200-$400 is that is even possible. Otherwise I'll wait 'till next summer.