Other than the size of the card, you also want to consider the write speed (the time it takes the camera to write the file information from your picture to the card). Memory card write speeds are grouped by class: Class 2, Class 4, Class 6, etc., each writing the relative megabytes per second to the card, i.e. Class 2 writes 2MB per second, Class 4 writes 4MB per second and so on. SDHC cards used to be slower than SD cards, but technology has caught up and there isn’t that much difference now. Of course, if you’re shooting in RAW, write time is anywhere from 1 to 3 seconds per file, and if you’re shooting in RAW+JPEG, write time is going to be even slower. I would recommend a brand with a track record, either a SanDisk, Lexar or the newcomer Kingston. Since you are concerned about speed due to the file sizes, you should get a 2GB SDHC card, Class 2 or higher (which will cost about $40-$50).