I know that many here think most electronics just sound the same or similar enough that it doesn't matter. That being said, my dealer's opinion is that Denon, Onkyo, etc have inferior analog sections compared to NAD. I was REALLY itching good to buy a receiver with new audio decoders as a pre/pro and he totally talked me out of it. Saved me money... well, if only for a short time! He says while the new formats may give me improved detail, he thinks that the analog sections provide quality of separation and dynamics. FWIW, there might be a few who choke on these words, but he has kept me from pulling out the wallet at the moment. BTW, he sells a lot of Denon 4308s, and can get any Onkyo that I might desire. He says to just keep my NAD T-163, and that he has many customers that are disappointed after swapping out their fine equipment just to get new HD audio formats...
In a nutshell, I think my dealer would vote for NAD. I might vote that way too now that I re-read your post and see that you listen to 65% music... The one thing that I will never have to consider upgrading is my multi-ch amp for HT... also a NAD. It really opened up my HT experience.