Hold on to the kidney...you might need a spare someday.
I'll get to audition a 560 next saturday, don't intend to purchase but have to admit that I'm REALLY curious. A friend whose ears I trust told me that it's not like the 6 but does bridge some of the gap between the other models and the 6 (iirc he owns a 500 and a 5LE). Anyway, he owns a 6 and wouldn't want to swap but he did say that if he'd have to start from scratch and knowing the commitment the 6 requires to get it to shine, he might forego those last couple of % and save a lot of cash and gear trades.
I dunno, can't envisage selling my 6 but I'm intrigued. On a side note, I listened to some classical and A/B'd between my HD-800 and my HE-6 last night, it struck me again how the 6 does so many things just right for me. The HD-800 is unbeatable in a couple of areas, the HE-6 is just a much better all rounder to my ears and as far as 'euphony' goes, there's simply no comparison.
and I'd love to hear the HE 6, I might wind up with the HE 560 before the year is over... if I can hear it first. But I'd still like to get a hold of the HE 6 or the HE 600 [if that comes some time soon as well]