If you honestly are having no issues getting accepted to medical school in the States, and you plan on working in the States, GO TO MEDICAL SCHOOL IN THE STATES. There will be plenty of opportunities to work overseas when you are done with your medical education, and the level of hassle involved with studying overseas and trying to get back through ECFMG is daunting to say the least. For example, I have a friend who did a research rotation overseas in China during his 4th year of medical school in the US, and there are plenty of opportunities to work overseas for doctors who are so inclined. I know of several US residencies that send their residents overseas (China, South America, Africa) as well.
As someone who is studying overseas and dealing with administrative crap on an almost-day-to-day basis, let me tell you that your life will be considerably simplified without having to worry about ECFMG, corrupt government officials, scheduling USCE, prepping for the USMLE despite a curriculum that has no interest in it, and everything else.
Numbers-wise, the chances of coming back to the States for residency from overseas are expected to diminish in the coming four to five years. Don't screw yourself out of an almost guaranteed US residency by going overseas simply because "it seems like fun." If you are serious about becoming a physician, then your medical education has to come first.
Just my .02... but coming back from overseas is no picnic, and I can only imagine that it's even more of a kick in the trousers from China.
BA - Oregon °°° MS - BYU °°° MD - MU-Sofia
"When I haven't any blue... I use red."
- Pablo Picasso