Tuscan Winery(ies) - Day Trip from Florence

I’m planning a couple visits for a large group staying near Florence in September. Hitting places closer to the city, like Antinori and Monsanto. I don’t need a full-service company to handle all the scheduling and payments and etc, but I do want to see if we can get a driver. We’d probably need someone from 9:30 until 4:30 or so. Any recommendations for a driver in the Chianti Classico region?