I disagree...if MPP stands for master's of public policy, I'd say Harvard, MIT, Berkeley and Stanford are all better than Chicago, Penn and Columbia. I'd even look at Princeton. Penn is pretty good in everything from the little research I've done on it, but I've heard that Columbia's econ department isn't as good as it's policy-oriented degree programs. Chicago is all economics, and if you're going for grad school to any of those places, you're obviously pursuing a PhD, which (at Chicago anyway) isn't going to leave any time for an MPP.
Good luck!