Torooblog: I can only afford one book on meditation. Which one should I get?

For example, I've heard "Opening the hand of thought" and "method of no-method" are helpful ones. Any other ideas? I have the discipline to meditate every day, I just need a bit of guidance to keep me in the right direction.

I'm also open to books from other systems besides zen.

Ewk, keep out of this thread. I don't want you here.