You definitely need to buy the first three plus anatomy. FYI, these are very recent new editions so if you get the older ones used, chapters might be slightly different. Plus the new assessment of the lower limb has an AMAZING CD rom this time around. I'd sell and mail you out my old ones at your expense

as I've just updated my editions, but it'd be better to get the newer ones.
If you need more reasons to suck it up and shell out, here are a few. You will use them for the rest of your career. You're in a professional program; these books will be added to your practice library when you graduate, so save your receipts for later (taxes). They will also be excellent resources for your evidence based/case study courses and exams later on. Remember the program is CUMULATIVE, each course/year builds on the previous, and it all ends in a composite exam and licencing exam for entry to practice. You can't just dump your books/notes/memory after the final.
The only way to wrench them from the hands of upper years is if they've flunked/dropped out.
You might be able to get away with reading the rest (except anatomy but especially research) in the library, and you can pick some up along the way if you find you like it or are heavily using it. Where's VALMASSY'S Biomech??? That's also a staple. You'd have to pry that one out of my cold dead hands....
Sarah