Anything Class 6 or higher will work fine for video, and also allows you to hit the maximum frames-per-second when shooting bursts in Continuous Drive mode.
Anything faster than a Class 6 is overkill; it can improve the transfer-to-PC speed, but the camera won't get any faster.
I have a pair of Kingston 16G Class 6's, and they work just fine in my Rebel T2i....
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