Well if you are going to Terre Haute you must try Moonshine for lunch. A warning, it's only open for a couple hours at lunch and it's hard to find. Great hamburgers and really great chesseburgers.

http://www.clarkcountyil.org/Communities/moonshine.htm

World's Best Burger (CBS Sunday Morning)
http://www.youtube.com/watch?v=NGkBilF6GU8