Your profile is impressive. You belong to a non-traditional industry and this sets you apart from other candidates. B-schools love to have applicants from various industries as they bring diversity to the class.
Your GMAT is not bad - just average . Good to know that you aim at improving your GMAT. A 720+ GMAT would definitely strengthen your profile . Since you plan to apply in Fall 2013, you will have sufficient time to prepare a strategy for putting together a strong application that showcases your candidacy in the best light for your dream school , North western. I would sugegst that you add 3-4 more schools to your list of target schools. The ideal strategy for you may be- 1 dream school , 2 mid range and 2 safe schools.
Good luck on your application.
I hope it helped.
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