Hmm tough quesition. I never quite understood why a lot of people apply to schoools that they're not even sure they would attend.
But that's besides the point. Basically there is no sure outcome in either scenario, but you want to pursue the one that maximizes your chances of meeting your career goals. If you have a full-ride to a top 30 (that's how I'm intererpeting your "everything covered" statement) then you must be pretty competitive. I would conduct a thourough review of the job search results from students at that school and see what the placement results were in the last couple years. I'd also call the career search group to find out more about the difficulties of international students.
Option #2 doesn't sound ludicrious, but the issue is that without a higher GMAT, it might be difficult to attain a top ten. Additionally, if you truly do have a full-ride that's not something that comes along to often. Basically if I were in your shoes, I'd have be pretty sure that I'd have a real tough time getting a good job from the school where I had been accepted before passing on the offer.