You have a very strong application. With regards to your work experience, experience past the 2 years can be helpful, to show expertise in a given function, maturity in your career and progression. However it is not essential.
Your numbers certainly indicate that you have the intellect and focus to thrive in a top tier MBA program. Nothing about your story makes me think there is any reason why you cannot be admitted, but nothing stands out telling me why you should be admitted. All of the reasons why a top program would admit you are in the details of your work experience, personal experiences, personality, values and overall story.
Here is some school specific advice for the programs you are considering:
Columbia: http://www.stacyblackman.com/business-s ... ss-school/
Haas: http://www.stacyblackman.com/business-s ... -business/
Kellogg: http://www.stacyblackman.com/business-s ... n-kellogg/
If you'd like, we provide free 30 minute phone consultations here: http://www.stacyblackman.com/contact/
Conrad and the Stacy Blackman
Interested in a free 30 minute consultation with the Stacy Blackman Team? Sign up here: http://stacyblackman.com/contact
Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap