If you're an independent learner, don't take the Kaplan course. You can get the study aids at Borders for about $25 (as opposed to $1000+ for the course) and you can study on your own time. If you feel best you work with a tutor and have the money for it, then feel free to take the class. However the books are just as effective but cost considerably less.
Princeton Review has the best books. I suggest "Cracking the GRE" and "Word Smart for the GRE". Also, take advantage of the free online practice tests, and take a look at the analytical writing topics so you get a feel for how to analyze them. I got 1400 (690V, 710Q, 6W) and feel as if I could have personally done better on the math section. The GRE is all about practice, not studying! if you familiarize yourself with the test, you'll do much better. It's all about what makes you comfortable.
Good luck!