also walkable in the neighborhood is the diner little pete's, the bishops collar, london grille (never tried but i know they offer brunch, along with a bloody mary bar) and my personal favorite mccrossen's ($20 for a good meal and unlim bloody mary's and mimosas).
Brunch at the Philadelphia Museum is not bad. The name of the restaurant is Granite Hill, its managed by Stephen Starr. Entrees run from 12-24 dollars, and brunch is served from 10:30-2:30. You can book through open table.