My goal is to study and research differential geometry (or a closely related field), and as of now I think I'd like to do this as a career. I am worried that I may have ruined my chances at getting into a good graduate school however (and thus the whole career aspect). I am wondering how true this is given my situation:
I'm currently an undergraduate student at a top 5 school per usnews (I only say this to keep anonymity) with a 3.3 overall gpa and I'll end with a 3.7 math upper division gpa with good grades in graduate courses. I received a C- in my undergraduate algebraic topology course and an A in the graduate version of this course. Additionally I have a letter of recommendation from the professor of the graduate course.
In essence I am wondering what caliber of school I am looking at. Ideally I'd like to get into a school good enough to ensure I have a chance at a career in the subject (what schools does this refer to?). I'd love to hear what anyone has to say about my situation and the more information the better.