I almost never buy textbooks unless it seems useful after I start a class. I could get away with not buying a textbook. All material we need to know is presented on the PowerPoint slides. I personally bought:
Medical Terminology for Pod Med I.
Rohen atlas (as I like real images, not painted like Netter. Each has a place though)
Gray's Anatomy Review book for questions and answers
BRS Physiology
Haines Neuroscience Atlas
Haines Questions and Answers
McGlamry for Introduction to Pod Surg (not bought yet. Too expensive, but necessary)
Nothing crazy. Not a single true textbook either. More review material to prepare for exams.
I would honestly wait until classes start to get an idea of what you really will want. Every exam question comes from the lecture or uses the material presented in the lecture.
Of course, this all is just my opinion and how I do things.