Dominick's is GREAT food!! So is Mario's, right down the street. Oh, man, are you making me hungry!!
Two of my all time favorites. Growing up a block and a half away from those places has made me kind of partial though.
However, currently, the best Italian food in the Belmont section of the Bronx can probably be found around the corner at Roberto's on Crescent Avenue.
In Manhattan I'll give the nod to Il Mulino (the original), on West 3rd Street. I'm in the West Village quite a bit and usually try to grab lunch there when I can. Dinner's too crazy.