3 years of WE is a little light, but not horribly so, and with the 6 sigma certification and a grad degree, you offer something more than the typical applicant. I think you can be competitive considering your very good GMAT score as well. I would focus on what makes you different than others with a similar background and also try to seek opportunities to lead at work and in your community. Leadership and teamwork are big areas of interest for b-school adcoms and you seem to have some elements of both. I think you should have a good chance at top 15 schools--particularly this year with applications down significantly due to the protracted down economy.
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Bryant Michaels
Admissions Consultant