My first post in the group. I just bought a Denon 4500 AVR (with two channels driver it is rated at rated 125watts per channel) and I'm running a 7.2.2 configuration (Infinity Primus towers 363's, center channel 250, right\/left rear, right\/left surround 160's and two Klipsch 3800 ceiling speakers set in the mid to rear position). I have two Polk Audio 12" PSW505 subs. Would you suggest adding a power amp? If so would you run the three front stage speakers off the power amp? Any suggestion on models and number of channels and watts per channel? I was looking at power amps such as the Outlaw 5 Channel and the Emotiva 5 Channel. Would a power amplifier make a huge difference in the details and clarity? Thanks for the advice!