We will be departing from Venice early in the morning, renting a car with our tuscan destination of Montepulciano in sights. To break up the 4+ hour drive to the southern part of Tuscany, and to minimize backtracking, we would like to spend 3-4 hours in either Sienna or Greve in Chianti. Where should we stop before we get to Montepulciano for the night? We will then be spending 5 nights in Monte. Suggestions? Thanks TA!