First of all, do not go to an international medical school. There are more medical schools opening up in the United States with residency positions staying the same. That means that IMG's (international medical graduates) will have a much more difficult time getting into a residency. The last thing that you want is to have medical school debt without a residency.
Like I said earlier, SDN is a great resource. I'm on there, and I have gotten great advice from some of the posters. Unfortunately, the medical school admissions process is VERY complicated. For example, if an admissions debate is between a 3.5 engineering major and a 4.0 art major, barring any major differences in MCAT scores or science GPA, the art major will always get in despite the toughness of an engineering major.
That's all I really know, but hopefully it can help.
Edit: Just saw that you posted at the same time that I did. Quite the coincidence. My user name on SDN is AntiHouseMD, in case you find my advice there to be garbage . I would ask that question on the pre-med forum if you sign up, as that's probably the place where you'd find the best answers. You could also try the surgical sub-forum.