2007 U.S. News and World Report Rankings:
1. JHU 4.9
2. Harvard 4.7
UNC Chapel Hill 4.7
4. Univ. of Washington 4.5
5. Univ. of Michigan 4.4
6. Columbia Univ. 4.1
7. Emory 4.0
8. UC Berkeley 3.9
UCLA 3.9
10. Univ. of Minnesota 3.8
these rankings are worthless. all of these are excellent ph schools. i chose berkeley over columbia and jhu for example. go where the program fits your needs