I had books that were from '01-'02 and compared them with my friend's who took the course this year and a lot of the books were nearly identical such as the anatomy/neuroanatomy, pathology, behavioral science, and physio. Micro was a little different format and the immuno section was substantially larger but the immuno on the boards didn't require any super indepth knowledge (atleast my q's didnt), and the pharm book was a little different too but I don't think it would be worth your while to spend that kind of money buying all new books...especially if you have access to the lectures online. I used Kaplan as my foundation and mainly used goljan path and FA as my other resources and broke 260 so I guess the newest editions weren't all that necessary!