I think they are all good receivers. I have been playing with them myself lately. I sampled the lower end of all of these guys and am getting inclined toward Denon. I sampled HK 335, Marantz 5600 and Denon 1905. Primarily for music, I loved the way the music just seems to open up, very well balanced, with enough warmth (I tried the Polk Audio Monitor series, as well as Boston Acoustics' bookshelf speakers) with Denon.
The best thing I found was to get these beauties home and sample your kind of music for yourself. I played a set of music for a few days and then the same set on another, just to get enough soak time.