2009 will be more than enough. Keep in mind that the exam doesn't change drastically from year to year. Especially now that it is pass/fail, the minor variation that may exist between the 2009 and more contemporary decks will not make a significant difference. Hope that helps.
So why are you guys still lugging around that shoebox of cards from the dark ages? Mobile study apps are far more efficient..plus you can study anywhere/any time you are free. I studied while waiting for my haircut last weekend.