Much of neurology is related back to the anatomy. If you know that, and the drugs, you're doing pretty good. I didn't buy a book. I used my old copy of High Yield Neuroanatomy, and went to my neuroanatomy texts (Snell, Kingsley is also good) if I needed more detail. For clinical info, I looked up stuff online (Up To Date, eMedicine, Harrison's Online).
If you don't know something, the answer is usually "let's get an MRI" or "how about some topamax?" 😀