I graduated last year with a triple major in math, finance and comp sci with a cumulative of 3.8 (3.7 in Math). Unfortunately, I do not have any math research experience (CS only). Now I'm thinking I'd like to go back and get a PhD in Math. Hopefully become a quant or teach after...

Although, I didn't take the absolute hardest math classes because I thought I would be a actuary, I did have a few (Set Theory, Graph Theory, PDE, Linear Optimization, Probability plus the standard set).

I also have some teach experience as undergrad (TA'd two semesters --although they were called Recitation Mentors if you were an Undergrad at Rutgers)

Any ideas what schools I should consider? I know Columbia and Courant are reaches. I was wondering what's more on my level and what are some safeties? I'd like to stay close to probability or stochastic calculus because rather than go off on the pure math side..