If you are looking at top MBA programs, I recommend you retake the GMAT. Remember that your highest GMAT score is self-reported on your application, so admissions teams will focus on your best score. Your current score is a fair amount below the averages of top business schools.
If you decide to take the test again, here is a free GMAT overview: http://stacyblackman.com/gmat-overview
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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