I have not hear the Supernait with the 805 D3. I can't answer how that would work out. I am making a recco based strictly on a paper matchup.
I found the depth of the AVM, it is 325mm or approximately 12.8". I know if has redundancy with the CD player and it is a bit over budget at $6300 but it does include a good DAC and has built in streaming.
I am largely out of ideas beyond that.