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andy beckermost knowledgeable and most helpful are two different thing. john has a point. the most helpful people are on this board....leon really stands out. others too. i have, many times, just emailed a person....who doesn't know me from beens. greg ecklund was my last victim 
....btw, thanks again greg for your help!
as for three names...lew, rob lifson, and bill mastro.
best advice goes to bruce....
"I would say the most useful thing I've learned is that when you get a chance to acquire a nice piece that you've never seen before, grab it because you may never see it again."