Congratulations on your superior GMAT performance! Wow! This score can open the door to remarkable opportunities for you - if you use it strategically.
I urge you to hold off on pursuing your MBA at this time. It's too early in your career. Furthermore, if you do pursue your MBA at this time, when you complete your MBA, you'll be competing for jobs with others who have their MBA plus 3-5 years of professional experience. You'll be at a significant disadvantage due to the lack of experience.
Take the position you've been offered, and gain as much managerial experience as you can. Try to get assignments that have a finance component in them. During this time, be planning financially for your MBA.
After you've gained at least three years of professional experience, then apply to top business schools. Your GMAT score is good for 5 years, so you've got a nice window to work with.
Here's the advice I always give to individuals who are just graduating from college:
You can only do your MBA once in your career.
The primary value of an MBA comes at an early stage of your career - but only after you've completed a few years of professional experience.
Hold on to that fantastic GMAT score, and pursue the MBA after you've gained experience.
I know it is hard to wait, but when you consider the long term return on the investment (ie, the MBA), pursuing the MBA after professional experience is the right path.
Good luck!
Wendy