I got married in Italy in summer 2011 (Magione, Umbria) and would like to pass on my recommendation for Guty & Simone.
If you like 'classic' rather than cheesy wedding music to dance to then Guty and Simone are a great choice - they have a large repertoire of English songs that are great for all the generations to dance to - they actually sound very similar to the lead singer of Dire straits!
They're great entertainers and really made my evening reception, staying much later than any English band would. They're versatile too - a friend performed a couple of songs with them.
I was very glad I picked them, Helena Wood 2011.