For my Step I, I used predominantly the 1999 Kaplan USMLE Review books, I bought them used. I found them written much better than the Kaplan 2001 COMLEX books my classmates were using. I read through the review books twice (I read fast but don't retain). I also did about two of the four tests in each of the BRS series. I glanced through First Aid once, and used Cracking the USMLE more than First Aid.
Two days before the test, study OMT Review by Savarese like it was your job.