First, congratulations on your success in application to PhD programs.
Although I do not have specific info on prelims nor info on your fit to either of programs, but I think I can talk about fundings.
What I have heard from my friends in other PhD programs, getting 3.33 is not difficult as long as you keep up with the matrials. So, I think you can get fundings. This will determine your additional 30k, so I would recommend Boulder if you are committed to your PhD.
Side note: if you are going to be a TA and later on become an economist, speaking skills is REALLY important. I think practicing your speaking skills and trying to get a high score in TOEFL speaking will be useful to your funding as well as your career.