I agree with sefago. If you would like to eventually do an MBA the MSB is a good place to start (but so are Georgetown college and SFS). The report I linked earlier indicates that most Georgetown B-school undergrads work after graduation (usually a prerequisite for elite MBA programs), while those that choose grad school usually go for a law degree.
On the other hand, if your interested in a PhD.the college or SFS would be better as a larger percentage of those classes choose to go to graduate or professional school immediately after graduation.
Here are the same surveys for the Georgetown College of Arts and Science, and Georgetown School of Foreign Service to give you an idea of what the various schools prepare students for after graduation.
http://www1.georgetown.edu/career_ce...rvey%20COL.pdf http://www1.georgetown.edu/career_ce...rvey%20SFS.pdf
I think, overall, Georgetown would provide more options than Indiana or Illinois for an MBA. And if you study Math and econ (and excel) at any of these schools, you will be set up for a competitive PhD program in financial economics.