I think a question you have to honestly ask your: What do I want to do post grad? Now if you're going the academia route, you can choose a school like say Northwestern, if you're an African historian & those "in the know" will respect that degree (if your profs don't slander/libel you, on your way out the door). Conversely, if you are going to go work in a non-academic field, your employer might not necessarily be part of that the cognoscenti, thus if you have a degree in African history from Brown (this is an example not a fact folks), then you'll prolly do better if you're competiting w/someone w/a similar degree from say University of Florida. There's a reason why the ivies hold sway even @ the graduate level.