I am travelling to Philly with a group of 10 or more and seeking an upscale place for lunch. There is a wide age span and I would like to find a menu that offers great salads, creative sandwiches as well as main plate meals such chicken, steak and fish---in an indoor, comfortable, relatively high-end atmosphere. Seeking high-end but not over the top fancy. (We are celebrating a college graduation). Center city would probably work best as we are staying at the Four Seasons. Any suggestions would be greatly appreciated!