I visited a few chocolatiers in Tuscany. I would recommend Andrea Biachini in Florence, Paul DeBondt outside Pisa, Simone DiCastro, Vestri Chocolates in Arezza, Slitti in Montemurro, and Roberto Catanari, and Luca Minnori in Pistoia. Hope this helps. BTW, there are a number of Italian Chocolatiers who will be at the Chocolate Show NY in November, another opportunity to see them.
Have a Great Trip, it is a beautiful country!