Preparing to Study Quantum Mechanics

[AlexChandler]

Hello,
I will be taking two semesters of quantum physics this year, and am looking for a good book to read before the fall semester to give me somewhat of a head start. Two books I am currently considering are Vol 3 of the Feynman Lectures, and Principles of Quantum Mechanics by Paul Dirac. Anybody have any recommendations as to which of these may be better, or any recommendations of other books that may be good?
Thanks!

[fss]

Of the two, Feynman's will be the most helpful to someone with no exposure to university-level QM. Other oft-recommended books are Griffiths (blue book with a cat on the cover) and Shankar (red).