Chance. I appreciate your input.

HST
Thu, 06 Jan 2011 10:43:27 +0000

I’d venture to guess that your chances are quite good. Based on what you’ve written, you seem to be the sort of smart, self-effacing and intellectually curious candidate that would fit in well at Chicago.
I would not worry too much about the class rank. As long as it does not suggest a poor work ethic (which it does not appear to, given your course load and extracurriculars), I doubt that it would be of concern to the admissions committee.
Good luck.