One thing to consider is that top PhD programs are usually looking for someone who is extremely passionate about the subject. A prof at the University of Minnesota (in the economics faculty) once mentioned that a good measure of the strength of a program is the inverse of the number of interests students have outside of economics. While I'm certain you can get into many good programs, without a strong passion for the field of economics in general, I think it will be hard to get into a top program.
GRE scores are also very important. Top programs require 790 or 800 in the Quantitative section. Hard to say what your chances are without a score to baseline with.