In addition to thew's recommendations I'd also point you to Darbar Grill. They're the restaurant I most often frequent, mainly because of its convenience, though the food is good, too. Though I haven't been yet, Tulsi has been getting some buzz on these boards. The chef was formerly at Devi, a Michelin-starred Indian restaurant.
157 East 55th Street, New York, NY 10022
211 E 46th St, New York, NY 10017
chola is in midtown. if you're talking the southern end of midtown youre almost in curry hill - , you could do dhaba on 28 and lex.
here's a place to start looking:
232 East 58th Street, New York, NY 10022
108 Lexington Avenue, New York, NY 10016