Hey~ So I spent a year in Oxford, and had somewhat similar stats (3.63/175), and will be going to Columbia next fall. I got in everywhere I applied, with the exception of HY. With that said, I think that a major component of my acceptance to Columbia was the fact that I applied very, very early in the cycle. I would recommend that if you're shooting for a highly ranked school that you have your apps in no later than Oct. 1. Good Luck!