Oh I see what you're saying. They are trying to switch people away from the older technology and trying to get people to use the latest technology available. So really the only major differences is connectivity? The power section and audio decoders are all the same?
Also, how is THX Ultra and Ultra Plus different? I've read that the different THX certifications are according to room size; is this true?
You will have to check up on this stuff, but I think* the 806 is a serious downgrade. Some think that the profit margin was too slim to offer such value. Others think that too many people complained about an Ultra amp section that got warm.
If I am correct, which I might not be, the 806 will be rated 36 amps, just like the 605/705. No longer 60 amps, or Ultra, which is supposed to be spec'd to handle 3.2 ohms AFAIK.
They will also downgrade the BurrBrown DAC to Cirrus, like in the 705, AFAIK.
The 805 is the one to get, and it'll be half the cost. There are some that say that an Ultra amp at less than 1k is already a deal. Dunno...