They had the Denon at $2,000 only last week. Now they are up to the full list price. I am still tempted by that huge toroid, and the Reon chip. And you are right, the main reason I am leaning towards the Denon is "reliability". After 4 years of heavy use, my 3805 is still in top shape. My 2 year old 1705 is always on, and it too, is in top condition. So it is not hard for me to believe Denon=Reliable.
The only other reason is the WIFI thing, the 905 is better in everything else. I may just wait for the 4310.