To add 2 more cents, beyond my listen for yourself recommendation...

I have a 990 and do agree with sb-avnut and avfan on the 990 over anything more expensive for another year or two.

I will also pick up on sb-avnut's "proper balance" idea and suggest you could think about the 990/7125 combo. Your Polks are quite efficient (90 dB), you have a sub, and you said your tv room is not that big. If you have not had separates before, the 7125 is far more amp than the amp section of the 2807 receiver, even though the wpc ratings look similar. The 7125 is rated at 125/190 wpc into 8/4 ohms with all 7 channels driven. If you read behind the fine print, the receiver is not. You could get 2 more RTi6's and go to 7.1.

Not that I have anything against 200 watts (said with a Tim Allen ARRH-ARRH-ARRH).