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With the 861 you are paying for flexibility and future potential. More channels (Height, subwoofer, ?), better DACs (more often with new DAC cards.), Multichannel analog input, <insert feature here>.

But with a price difference like that, wouldn't I be better off saving my $15k and selling my 568.2 when the next best processor comes out? It's not like $15k buys me economies of upgrades. I could buy two more 568s at that price, and I'd always have the latest.

Oh well, are you saying that the sound really isn't that different?