You don't need to spend any money on a book. I built a PC without knowing how to do it via internet. :shrug:
Exactly. With the internet there really is no reason to buy a book nowadays. The components come with a manual most of the time, and those manuals are likely to be much more detailed then what you'd find online as well. And what ever happened to figuring things out for yourself? It doesn't even sound like you consider that an option.
Anyway, as for the actual question, the 2006 book would be outdated and may not exactly apply to all situations you may encounter, meanwhile the 2010 is almost guaranteed to be more helpful, if not for the sole reason of it being more recent.