Class 10 cards deliver on speed for HD video capture, which goes along with the size advantage of the SDHC spec. For more details on what all the classes and card specs mean, check out my resource article Demystifying SD Cards.
Additionally, the 60D kit with 18-135mm IS lens is only $899 (reg. $1099), and includes a free camera bag and SanDisk 16GB Class 10 SDHC card. Check it out here at B&H Photo.
Both deals offer free shipping in the US and 2% Rewards in B&H Photo’s Rewards program.