Regarding your extra-curriculars, I recommend you read this case study below. Extracurriculars are important because they not only show a well-rounded candidate, but they also provide an opportunity for leadership experience. http://www.stacyblackman.com/2011/07/28 ... ctivities/
An extra year of work experience will help in your application if you are given more responsibility and can exhibit progress in your career.
Overall, 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:
Wharton: http://www.stacyblackman.com/category/u ... on-advice/
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MBA blogger, US News and Author, The MBA Application Roadmap