Do you have any good reason why you might pick UW or Harvard over the others - area of interest, professors you really want to work with?
Otherwise, it seems clear to take the one that gives you the money, and as others have pointed out, Berkeley is pretty much well-recognised, even if they are ranked slightly lower.
P.S. Might be nice to of you to reject the other three schools early if you're sure you aren't going to accept their offers!