If you did receive C's in many of your undergraduate classes, you should address this on your application. First, here is a case study of an applicant with a low GPA who was accepted into Chicago Booth and Columbia: http://www.stacyblackman.com/comprehens ... ies/case5/
If you decide to take outside classes, when you sign up for classes don’t worry too much about the prestige of the school. Business schools understand that you may not have a world class university nearby, and need a convenient option. So you should worry less about the school, and more about the coursework.
For your leadership experience, have you considered looking for opportunities outside of work?
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MBA blogger, US News and Author, The MBA Application Roadmap