I liked the Barron's GRE prep book. They treated me very well on the test. 14 is right review the word list several times and work the reading and math problems. Also make sure to work on your reading speed before the test.
My experience from looking at reviews on Amazon.com and on here in the Pre-vet forum have been that Barron's and Kaplan are the two most used. I know I have the Barron's book but I don't remember what other book I got from kaplan. I would look at reviews from amazon.com to find the books that would most suit you. 🙂