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Joe D.Jim Clarke's website.
so he has to be way up there on my list.
Leon, Steve M, Keith O'Leary, David Rudd (although I don't believe I have seen his stuff / just going by his knowledge), Bruce Babcock, and a bunch of others here on N54 that I apologize in advance for leaving out.
They would all be on my list.
Admittedly, I don't have the broad knowledge of the hobby and its major collectors enough to have a really good say about it.... but those are the people who I have seen incredible stuff from.