Your best options for joint 3 year degree programs:
HKS/HBS
HKS/Kellogg
HKS/Wharton
HKS/Any other MBA program they let you combine it with
Your other joint 3 year degree options:
Chicago
Columbia, especially for international affairs
Michigan, especially for sustainable business practices
NYU, especially for non-profit or non-federal public management
Duke, especially for a focus on healthcare
Carnegie Mellon, especially for technical aspects of either public policy (polling, demographic modelling) or business (systems implementation, etc.)
Your consecutive 4 year degree options:
Berkeley
Princeton (Woodrow Wilson) + any top-15 MBA program
Northwestern
Your best MBA-only programs:
HBS
Stanford
Wharton
Yale
NYU
Columbia
Notre Dame
(Reference:
https://www.beyondgreypinstripes.org/rankings/index.cfm)
I'm starting at NYU Stern/Wagner in the fall and researched this a bit myself so feel free to reply or PM if you have other questions.