Le Zie immediately comes to mind but it is not in the Village. Crispo can accomodate a larger party if you reserve with a few days notice. Borgo Antico also comes to mind but I have not been there in a few years. Crispo and Borgo are both on the northern fringe of the village.
Definitely Bianca. I once went with a group of 8 and we had an amazing time. Each had an app and a pasta, shared dessert and three bottles of wine, and when we split the bill it was only about $45 or $50 a person. PS: Get the lasagna bolognese.