Adams and Victor "Principles of Neurology"
Bradley and Daroff "Neurology in Clinical Practice"
Merritt's "Textbook of Neurology"
Patten "Neurological Differential Diagnosis"
Samuels and Feske "Office Practice of Neurology"
The top two are the "tried and true" neuro texts, like Harrison's is for IM. They are rather dry, but useful when you want to look up something specific.
The bottom two are much more modern, and in my opinion are easier to read. Patten is great because it is case-based and incorporates a ton of neuroanatomy with good drawings in the teaching. Samuels and Feske is a very practical text, with a lot of great pictures.