I am very new to this great hobby. A few months ago I decided to get back into the hobby. I had a Marantz 7500 that I wanted to replace with a receiver that supported the latest Codec.
I was looking for a receiver that did very well with blu-rays and even better with music. Most dealers don't put any time into setting up their system thus making very difficult to compare the different makes. After several weeks of going from store to store I decided to go with the Denon 4310. Excellent receiver with many features, excellent surround sound but when it came to music, a little flat. I started to miss my Marantz.
Well today I decided to spend some money and got a MX-135. What a difference, the detail in the sound is day and night comparing to the Denon. Spent hours lessening to music, the TV never came on. If you are looking for a unit that works exceptionally well with music, I would keep this one on the short list.
Sorry for the long post, just wanted to share my experience.