805 easy. $600 new Amazon last I heard. Some folks got em at $425 last week at shoponkyo, which is an absurd deal.
However, its very heavy, definitely over 50lbs, maybe 52-53? Its big too. Runs warm. Good ventilation is a bonus, or cheap fans can work too. Mine is in an open audio rack.
The new 806 coming out is actually going to be a considerably inferior unit, while costing hundreds more. Get the 805 while you still can. IMO, its been the best value of '08. By getting the Ultra amp in the 805, might you have much better flexibility in speaker choices down the road as well.
edit: $425 is refurbished. Mine is refurbed. No problems. Works like a champ. Amazon has been noted to have more recent FW, which is nice. Personally I don't care cuz if it ain't broke I don't fix it, and that includes my BDP. Amazon has better CS than Onkyo would as well. IOW, the extra money could be worth it to some for a new unit. After all, I bet the 805s at o.s. are sold out. But you can check in on a daily basis. They come, they sell out in a day, some time later the process repeats itself.