Curious as to comparative opinions on the following brands in terms of music performance. I'm thinking about models in and around the $500 range: Onkyo SR600 H/K 320 Denon 1802 Tested several of these recently, and was impressed with the Onkyo and the Denon. Had heard great things about H/K's musicality, but didn't really discern a large difference. I'd probably choose the Denon among all three, given its other features. Thoughts?