I will be posting lots of reviews from CanJam (which was awesome, go see my thread in the CanJam forum) but for now I just want to say this:
If it weren't for Todd getting me my HD800 before CanJam, I would have returned them. They are (by far) the most amp-specific headphone I have ever heard. They are in a different league when balanced, but some single-ended amps sounded almost as good. And in many ways (and quite possibly overall, in my opinion) beat out the HE90 and R10, although the R10 on Blubliss' system was a wonder to behold.
My favorite amps in all of CanJam for the HD800 are (and I listened to them on at least 40), in order of preference:
1) Sonett, by Donald North Audio (single ended or balanced versions available, but I only heard it single-ended so I can't even imagine how well it will sound with his balanced amp, which he claims is a true balanced output but only has RCA inputs). This one stole the show for me (and for my girlfriend! and she's very picky
), and considering it's price it is a no brainer (single-ended and balanced output versions are the same price, $1300, or $1000 for anyone who attended CanJam). Not only superb with the HD800 but with every headphone I heard it with. It's a tube amp but sounds more like solid state, with the richness and organic qualities of tubes.
2) RSA B-52 (balanced) $5,500
3) RSA Apache (balanced) $2,995
Tied for 4th) Woo Audio WA22 (single ended) $1,800, ALO Audio Amphora $1,000
5) Woo Audio WA6SE (single ended) $1,150?
6) Rudistor RPX-300 (although I only heard this in single-ended. It's presentation is very different than any other, it's very smooth and refined.) $2,500