I would say that if you don't feel like you're going to improve anymore at this point score-wise, focus on the other aspects of your application, and you should be okay. If, however, you feel like you're capable of strengthening your score, maybe try it one more time. Statistically you're not likely to improve much beyond your 2nd score, but that's just the law of averages. Nothing says you can't study hard and rock it the 3rd time around
Either way, you're right that the quantitative parts of your application outside the GMAT score will help you. I'm going to be attending a similarly ranked school (Maryland/Smith) with a similar GMAT (650) and I believe it was my science undergrad degree that helped me get in. Your work in Finance will look that much better.Scholarships are hard to comment on as every school has a different angle. I think your chances are better because of your GPA but lower because you're a middle of the road candidate for these schools, not a 4.0 GPA/750 GMAT applicant. My advice would be to find out if they have opportunities, like fellowships. Your past leadership positions may help you in that respect.
Good luck!
