Thank for posting. Congrats on the success on your career thus far. Unfortunately I do not know many details about the businesses you have started, which will be a key part of your candidacy.
One part of your application that will be critical to your acceptance is your letters of recommendations. I recommend you read this case study of an entrepreneur who was accepted into Chicago Booth with a large scholarship:http://www.stacyblackman.com/2011/05/19 ... r-dilemma/
For the programs you are targeting, I recommend you aim for a 700 GMAT score at the very least. MBA admissions teams focus on your highest score, so do not be concerned if you have to take the test a second time. Also, MBA.com provides 2 free official GMAT practice tests which provide great prep material.
If you are interested in a free 30 minute consultation to talk more about your application, you can sign up here: http://www.stacyblackman.com/contact/
Hope this was of help.
Conrad and the Stacy Blackman
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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