What kind of Secure Digital card should I buy for my HP Photosmart M525 digital camera?

I realize that HP sells one, but I'm sure I don't have to use its brand, which seems overpriced. I'm looking for a 1GB card with the fastest data transfer speed possible, and there is nothing in the user guide or on the HP Web site about maximum data transfer speed for the M525. HP's 1GB Secure Digital card says only that it has a "high transfer rate."