Tosca Ristorante was a absolute treat for me during my recent trip to the Raleigh/Durham area. Even though we didn't have reservations we were made to feel comfortable and seated right away. The service was attentive and even the manager stopped by the table to ask how the meal was.
The food is fresh and delicious - I felt like I was in Italy or NY. They have a great wine selection and if I'd had room for dessert I would have definitely tried any of their offerings.
The restaurant is built into a converted factory and still has the original brick walls making the entire space warm and inviting. This is definitely a special occasion place, but it's casual enough for every day with their outdoor seating which is also good for lunch.
More information can be found at this http://triangle.citysearch.com/profile/11561837/