If you're aiming for Finance, you should be aiming to score >700, and really as high as you possibly can, with the goal of maximizing your Q score.
How did you do in the math classes? Which classes did you take?
You were a research assistant for a finance/accounting prof who will be providing you a letter of recommendation?
I think if you score well on the GMAT, and if you can get those good recommendations from your professors that you stand a pretty good chance to get into good schools... but Finance isn't my area so take my advice with a grain of salt.