Thanks for the great feedback so far. I believe I'm pretty much set on the Onkyo TX-SR505 which I can get from Onkyo direct refurb for $179 saving a few bucks over accessories4less (though they do have some great deals there as well).
As for my speakers I have the following:
Fronts: Polk MiniMonitor
- 42Hz - 25kHz
- 10 - 100W
- 90dB Efficiency
Center: Polk CS150
- 100Hz - 20kHz
- 10 - 100W
- 89dB Efficiency
Rears: KLH HT-60 (can't find the specs)
Sub: Mirage LF-100
The MiniMonitors use to be my surrounds when I was using a pair of Bose Interaudio fronts. Due to space constraints I had to retire those and grabbed 2 of the KLH rears from my parents old setup. They work for now but I'm looking to change them.
I'm very happy with my Polk setup for the front and center (they were also good as surrounds though you can't find them very often for sale anymore).
I'll be sure to post my results with the 505 if/when I pick it up.