This is really a difficult question to answer well.
The curriculum is largely the same at all the schools. Students from one school will tell you their school is better, blah, blah, blah, but I've seen and worked with brilliant students from every school.
Its really your post graduate residency training that will separate you and as you may know, ALL residencies will be three years starting July 1st, 2011. Right now there seems to not be enough residencies for all the graduates, but by the time you would gaduate, hopefully this issue will be resolved.
I would say go to the school that you like geographically. If you can't stand the cold, stay away from the NE and North Midwest. But really as in any educational institution, it is what YOU make of it. The tools are available at all the schools for you to shine.