After a bit more thought, I'll throw up a more concrete opinion. Unless you have a good local dealer with excellent technical capabilities I'd be wary of buying Audion. My story turned out OK in the end, but there were serious bumps in the road. The amp arrived with both assembly and shipping damage that required replacement parts ( a cap and power transformer) to be obtained from Audion. That added about two months to the already extended delivery time. Fortunately the repairs were done here and didn't require the amp to make two more Atlantic crossings. If I hadn't had such a good dealer I'd have been in real trouble. I'm glad the things turned out well, because the amp I got is exceptional in every way, but I'd be hard pressed to recommend that someone else expose themselves to this kind of risk.
I have no way of choosing between Wavelength and Art Audio, but if I had to do it again I would definitely choose one of them.
I have no way of choosing between Wavelength and Art Audio, but if I had to do it again I would definitely choose one of them.