Lunch near Joyce Theater
I second all of those suggestions. Also, if you wanted pizza Don Giovanni's is relatively nearby and yummy. You should pick up a slice of banana cake at Billy's bakery if you have time! I also like Le Zie in Chelsea for another italian option. Oh, and there's a vietnamese place on 9th at 20th that's great too...
172 7th Ave, New York, NY 10011
358 W 44th St, New York, NY 10036
Gascogne, the sweet little French bistro, is on 8th, b/t 17th & 18th (closer to 18th). Good food, efficient service, and one of the most charming back gardens in the city. In addition to their a la carte menu, they offer a 3-course lunch prix fixe for $21.
Gascogne photos: http://www.flickr.com/photos/11863391...