if you are going to consider an Onkyo, I would suggest the 2010 "8" series, where they have addressed the heat issues. SR508 / SR608
The year old Denon would be a good choice also. Some have found the Denon manual a little hard to follow, but this gentleman has extensive knowledge of the Denon line and has published a "dictionary" of Denon speak.
www.batpigworld.com