I have been through my share of guys as well. I will not list ten but, I can tell you who I thinks belongs in the Top 50 and Top 100:
Brian Manzella (I have yet to take a lesson, but I will here soon, I can tell by the knowledge on his site he knows what he's doing)
Ted Fort(I'm currently working with Ted on my hitting machine. What a passionate teacher with a great understanding of golf including TGM).
David Orr(I spent a year with this guy, he's amazing, but he floats just under the radar on purpose, helping the future golf minds of instruction. A day with David can wear you out, he will teach and teach until you got it.)
Mike Hebron(His book Golf Swing, Secrets, and Lies is a great resource for me. I can't wait to meet him to.)
Lynn Blake(The leader of east coast TGM! Enough said)
Ben Doyle(The leader of west coast TGM! Enough said)
and finally,
Mac O'grady(Maybe the most misunderstood of all teacher's, but from what I've hear he has more information collected than any other teacher. Also he's the only person that I know of that can do at least three models both right and left.)
These guys are Good! Go take a lesson from them or do some research you'll see!
Sorting Through the Instructor's Textbook!
B-Ray