Our Tuscan wedding was grand. We did it there because parents own a house there in the country-side but there are plenty of great villas and palazzos to rent. A very grand one to look out for is Villa Artimino north of Florence, owned by the Frecobaldi's.
First class, Italian thoroughbred catering. Delicious food and wine coupled with VERY good organisation. Ask for Massimo Marchetti, the owner. His team are really good and think of everything.
A very nice place to do it, also because it is our local church. Nice natural light, but relatively small. We squeezed 150 in but not everybody got a seat ;-)
Click on each tool to see a sample.