I think I'm going to swap out my Denon for a used Anthem MRX 720. From what I've read, it'd be worth it just for the improvement that ARC brings over Audyssey.
I'm very impressed with ARC over my last two Denon's with Audyssey. And I have not taken the time to really dig into the program and make room tweaks. I just ran it the one time with five locations and called it good.