Breakfast: Sarabeths's east or west side (go early!).
Casual lunch (believe it or not) Cafe SFA on the 8th floor of Saks Fifth Avenue opposite Rockefeller Center. Either eat at the counter, and watch the people, or go for a window table overlooking Rock Center or St. Pat's Cathedral.
AND MOST IMPORTANT:The Only REAL FAMOUS RAYS PIZZA is on 6th Ave at 10th St., NW corner.