I have to buy one of these books for pharmacology/therapeutics starting in a few weeks. We can pretty much pick any of them, since we don't really follow the book in class. As long as we can look up the information, it will work. They are all about the same price, and I've flipped through them all, but I don't know how they are really going to compare. I've heard that one of them is written on a little bit "lower level" than the rest, but I don't remember which one. I don't want the "simple" one. Soooo. .what are everyone's comments about them and which one should I spend my hard-earned money on? Are new versions expected for any of them?