If you're thinking primary care, you might want to check the NHSC. Call them to find out what their policy is on IHS sites; the last that I heard was that they are assessing all of the IHS sites to give them an HPSA rating (all IHS sites used to automatically qualify and NHSC scholar sites). I looked at the IHS loan repayment program and the NHSC scholar or loan repayment programs both offer more $ (although not a guaranteed IHS assignment, if that's what you're looking for).