This is what I bought.
http://www.amazon.com/gp/product/B0046REG58/ref=oh_o00_s00_i00_details
These are the instructions I followed.
http://www.gamespot.com/features/6176090/how-to-upgrade-your-playstation-3-hard-drive
You have to reformat whatever you're using to backup your saves to Fat32, probably the most annoying part.
You'll also need to manually download the current PS3 firmware from sony onto a flash drive once you complete the HD transfer to put it on your PS3.
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~LtM
http://img.imgcake.com/1309914563818gifpa.gif