as i wrote in a PM, i disagree with riceman....as a penn ss student, I think someone with your good GPA would get into med school after only a few classes....3.4 + 4-5 more A's will put you in good shape in a short period of time relative to a masters....although i'm not too familiar with the details of gtown is it one year or 2? that might change my opinion....
either way you really cant go wrong i have know many penn and gtown students who have starting from way lower gpa's than yourself and have done just fine.