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I'm glad that you resurrected this thread as it I had missed it back then and it's very cool. Congratulations on the way you structured your campaign: plenty of great ideas to steal!
Oddly enough, despite all the DMing I've done over the years, I don't have a single 'best moment' kind of event that jumps out in my mind. I do remember a couple of such moments as a player, but not as DM.