Non-Traditional Applicant

I am interested in pursuing an MBA, however I have something of a non-traditional background. My question is this: which first tier MBA programs are most open to accept applicants with non-traditional, especially non-business backgrounds?

Here is some more relevant background information on me:

I am currently on fellowship in a Ph.D. program in philosophy at the University of Michigan. This is one of the top philosophy programs in the US, and extremely selective (<4% acceptance rate). Prior to that I taught high school for three years. Prior to that I graduated from the College of William and Mary in Virginia, magna cum laude (3.74 GPA), with a major in Philosophy and a minor in Mathematics. Along the way, during a hiatus from school, I worked 18 months full time in sales and accounts for a construction company, and also started my own small business. At present, I am in the process of incorporating a non-profit to deal with certain diversity and practical issues within academic philosophy.

I have not yet taken the GMATs, but I tend to perform in the 97th percentile or better on standardized tests.

For a long list of reasons, I have decided that I would prefer to pursue an MBA rather than the Ph.D. and intend to apply to MBA programs after completion of my M.A. in philosophy in December 2011. I will apply for admission for Fall 2012. I sincerely appreciate any advice.