3806 and 4306 users at AVS are reporting issues with them being about to play nice with 6 and 7 channel lossless PCM. It is a firmware issue and they have been told by Denon that they need to send their units back to Denon to get the firmware updated. Users of the 2807 are not reporting problems. Actually, the 2807 seams to be the best AVR on the market right now for playing well with HDMI audio off the BR / HD dvd players.
I think you should stick with what you have. The 4306 doesn't have much of a leg up on the 2807. You have to go to the 4806 to get much as far as SQ components go.
