I have an AVM2 on the way. I was able to demo the unit with some B&W N803's which I will be acquiring in the near future. I was extremely pleased with the sound. I considered the B&K but was very concerned about reports of a popping noise when changing inputs. One of my friends has the Ref 20 and has this problem. I also encountered this problem during a demo of the B&K AVR307 which is essentially a Ref 30 and amp in the same box. I know I would find this very bothersome. However, I do believe that the B&K has better bass management capabilities. I would strongly suggest listening to both units (if at all possible).
Good Luck
Good Luck