Professor Leiter has generously provided a partial preview of the PGR rankings in Political Philosophy. Check it:
Group 1: Harvard, NYU, Arizona.
Group 2: Brown, Oxford, Princeton, Stanford, UCL, Yale.
Seems about right to me, though I'd advise a student to go to Arizona over either of the other Group 1 places. In fact, it seems to me that a lot turns on what a student's particular interest within political philosophy happens to be. For students who want to work in democratic theory, I'd say Brown, Stanford, and Arizona are tops. Stanford would also be tops for political philosophers interested in feminism. For those interested in history of political theory, liberalism, and freedom, Princeton is certainly the place to be. For those interested in justice and global issues, I'd advise Yale. So a lot depends on what one's interests within the area are.
Of course, this is precisely the kind of conversation that the PGR is aimed at helping students to be able to initiate and participate in. Three cheers for the PGR!