Based on your interests, I will vote for Michigan Ford.
1. The program is very quantitative. There're lots of quantative electives to take other than the core quantative courses. Besides, there're bunch of faculty members who're strong economists, some of them even hold positions at Business schools too. Besides, I think Ford is very well known for its down-to-earth kind style of equipping students with strong policy analysis skills. For example, Ford has three full-time staff who help students with their writing skills, that is very rare and impressive.
2. One of the biggest features about the MPP program at Ford is that it gives great support to students who do interdisciplinary studies. You can find lots of the cohorts who do dual degree programs at Ford. And Ford utilizes the entire UMich resources for those students. Umich has lots of professional programs that ranked highly around the nation, including business, education, social work, enviromental studies, etc, and that I beleive offers you wide range of opportunities to explore your interest and potential.
CIPA is flexible but not quantatitive and analitical enough; Heinz and Harris is quantatitve but will not offer as much possibilities as Ford does; GPPI is not quantative enough.
Good luck choosing your best fit!