Although it sounds like you are more interested in high-end eating, I felt I must recommend Regina Pizza because it was so outstanding. We were in Boston a few weeks ago and went with a recommendation for a North End Pizzeria. Pizza Regina is fairly small and crowded. People line up to get a table. The service is warm, friendly, and quick. It is the best pie I ever had. We went for the classic with the Regina sausage. Regina was recommended in 1001 place to go before you die and that book has been my guide to many a fine meal. We have eaten at Mama Maria but Pizza Regina is the meal we will remember.