You absolutely have a compelling candidacy. Congrats on the excellent GMAT score.
What is going to be most important is that you address why you are interested in business school, and how it will play a role in your future career. Regarding your background, business schools are looking to build diverse classes, so you should not be concerned about your lack of business experience.
Here is some school specific advice for the MBA programs you are considering:
Darden: http://www.stacyblackman.com/category/v ... en-advice/
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Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap