Surely this site isn't that parochial?

Yeah, sure. That's why I'm putting my feelers out to other members calling on their hands-on exposure to alternatives. The US is the world's biggest market place and many interesting amp alternatives for the HD800 are available. For example, that was great feedback earlier in this thread on the HEADA.

Europe's not that bad!!!

Obviously , but that doesn't seem to satisfy our friend here.

I'm just giving you advice from what I've owned and demoed.

Every burson amp I've owned or auditioned was mediocre. This is not a reflection on Australian manufacturers at all, but rather that Burson (I've owned the conductor and demoed the Soloist for a few days) doesn't make the best headphone amps. The Bryston BHA-1 (a Canadian company) is superior in my experience, but still not up to snuff for the HD800. Headamp, a US company, is using amp designs that were solid a few years ago, but have been outpaced in recent years. The GSX MK2 has always  lacked what a good Dynahi can do.

In my experience, Craig really does make magical amps. The Black Widow is the closest I've heard a solid state amp approach the resolution and staging of the best tube amps. In fact, it is superior to many of the best tube amps I've heard as well. Over the last 5 years I've held jobs that have had me traveling pretty globally. I try to hit up headphone shops like Yin Yue/hifi.tw in Taiwan when I travel. In all of my travels, nothing has bested the best Eddie Current amps at all.