blacklemon, if I'm not mistaken, the physics committees place more emphasis on physics/math grades than on the overall GPA so I would think that your overall GPA is not prohibitively low; however, since there are so many international applicants with perfect PGREs and grades, I would guess that the committees might end up using the overall GPA as a distinguishing factor between two otherwise similar applicants. My personal hunch would be that unless you have stellar research and a near perfect PGRE, the top 10 might be a bit of a reach. Nevertheless, with a slightly more modest PGRE and with solid research, I'd think you might have a shot at top 20 schools. Of course, there are many other factors that go into the process: letters of recommendation, who wrote the letters, where your research is, publications you have, which foreign country you're from (from what I've heard, it's harder to get in if you're from India, and even harder if you're from China), etc... bit I'd recommend looking through this thread
to get an idea of what it takes to get accepted, maybe you can find some profiles similar to yours. I hope this helps and good luck with the application process!!!