According to the 2010-11 school selector (which you can download from SDN), if you sort the schools by % international accepted, you can get a (very) rough idea. From highest to lowest, here are the top 30:
Dartmouth Howard Yale Vanderbilt Case Western Duke Johns Hopkins Wayne State Washington U Jefferson Loma Linda Columbia Boston SUNY Upstate Harvard Rosalind Franklin GWU U of Kentucky EVMS Penn State Northwestern U of Chicago Mayo Emory U of Southern California Stanford U of Hawaii Michigan State Texas A&M Mt. Sinai
For Dartmouth, % International accepted is as high as 15%!!
The 2010-11 School Selector Excel Spreadsheet has other information regarding % international interviewed, and raw numbers of internationals accepted. Good luck and hope this helped.