Your numbers look good - depending on your math background, I'd say you have a shot at just about every program, perhaps excepting Stanford, Chicago, Wharton, and the like. Have you taken calc, stats, and/or linear algebra? How about intermediate microecon? The tippity-top schools expect those classes before you enroll. Also, make sure you study up on research in your field of interest so that you can write a solid
statement of purpose. Finally, get working on recommendations now. Getting three academic references is ideal; professional references, while acceptable, don't mean as much.