I don't remember if I got the 17th or 18th, but I found the CD Rom that went with it, which contained 1,000+ questions, very useful. Now, that won't be enough for the USMLE-1, but that may be a good start.
In sequence, I studied: Rypins' basic sciences review, then Kaplan Home Study books ($500), then Princeton Review ($400), then Kaplan Q-bank on line ($200 for 3 months). Now there is also the Q-clinical vignettes by Kaplan ($200 for 3 months, or $430 for those plus the Q-bank for 6 months). Of course I used many others such as BRS Pathology, First Aid, etc,. My strategy was, I drew a rectangle with a line diagonal to it. The 2 areas represented the amount of time I spent on reading vs. practicing. I started with 100% reading and 0% test-taking. Then I read less and practice my skills more, until the end when I read 0% and practiced 100%. Exam day was just another day for me, because I had practiced on computer for more than 10-15 hrs a day for weeks before that. No pressure. In fact the real exam was easier than the ones I practiced. Took me nearly 3 months (extra time) to get the result, because it flew off the chart. I was told the Board actually viewed the video tapes to make sure there were no irregularities.
For test practice, I also recommend Exam Master, Alert, Board Simulator besides the Rypins'. The Biochem parts in those are useless--they are too hard and that may distract you or waste your time--but the PATHOLOGY parts in all those are very useful.