Thanks for sharing your profile. I believe a lot of your candidacy will be based upon that GMAT, as well as your essays and how well you convey your 'story', linking your past to the MBA and to your future goals. The committee will be curious based on your profile why you are now interested in investment banking. Your GMAT will be the place to demonstrate your quantitative skills and also help counter balance your GPA (so you had a 3.2 overall? That is a bit of a flag potentially).
While it's great that you feel you can hit the 720 or so mark, I encourage you to focus on some thorough preparation again, as soon as you can (since the skills/prep from 2 years ago will not be fresh now) and work on getting that score so that you have a better feel for the level/ranking of program you should apply to. In the meantime it's also time to start brainstorming for and preparing for your essays.
Keep us posted on questions and your progress. Good luck!
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