All three schools would be considered comparable academically, so the best thing to do would be pick one where you think you can excel the best (or perhaps resonate with a faculty member doing research in a particular area of marketing that interests you. For getting into PhD programs, a really good GPA in grad school will help, as will recommendations, so whereever you choose, just go there and knock em dead. You should have a good shot at a PhD program from any of the three if you excel while you are there. ANother thing do do would be to go ahead and contact the schools to which you are considering applying for the PhD program and simply ask them which of the three schools they prefer, explaining that you have been accepted to all three. You may just get the direct insight you seek by doing so. A final tip would be to apply for and pursue the PhD simultaneously with the MS degree--should cut a year off the schooling and might be an easier application headache to get accepted now for PhD program while you are pursuing the MS.
Thank you for your response! I felt that they were comparable academically, but wasn't sure if one had a better reputation than another. You made my decision easier
Thank you again!