SD Card classes

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http://forum.xda-developers.com – Hi guys! I'm planning to buy a new memory card for my Arc S. I just want to ask if it's really worth getting class 10 memory card or should I buy class 4 instead? Originally, I'm planning to buy a class 10, but yesterday I read something that class 4 cards work at par as class 10 cards if used in mobile devices. Someone also said that there's no difference in 720p video recording between the two classes. And now I'm thinking which kind of card to buy, still can't decide. Any suggestions? :) (HowTos)