I only have the Draw Your own Manga: Beyond the Basics from Kodansha, and is pretty useful, it doesn't for begginers in manga(because they don't teach you how draw)but it have a lot of tips and quick help for everything, from perspective to sounds effects and color, so i carry it everywhere.

I actually don't know how much is it because it is a very old gift, but if i lose it, i will buy another. I suggest you to check the books, because you need something that help you to improve your style, no something that try to change it(but still i recommend you the Beyond the Basics)

And i agree with ~mooncow2005, the American ones sucks.

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Good Idea: Sora sets fire to the Pooh's Book.
Bad Idea: He does not..

<sub>i live in my lovely box!!!1!

(my english sucks)</sub>