My chances

I am a graduate student in medical physics at UCLA. I am on the PhD tract and still want it, but I am strongly considering applying to medical school. As an undergrad I was a double major in Physics and Physiology at UCLA. For undergrad my cum GPA is a 3.0, but that was mostly because I held a full time job. My last year and a half as an undergrad I had a 3.8 because I finally got financial aid. My grad GPA is a 3.9 I have published research from undergrad as well as graduate school, and very strong letters of recommendation. I have to retake the MCAT because it was more than three years ago that I took it, I got a 30 "cold" my first time around, I am sure I can do better than that and am not too worried about it. My question is, how badly will I be penalized for my undergrad cum. GPA? How will my graduate GPA be weighted? I think that towards the end of undergrad I proved myself (you don't ace quantum physics if you can't hack medical school), but I also realize the politics involved with the numbers game (school rank order, NIH funding, etc.) and am hoping I won't be a victim of it. Does anyone have anything to offer?