I'm wondering which memory card I should buy for my D800, as I got a $50 gift card to Unique Photo for Christmas. I'm definitely going to stick with a 32 GB card, but I'm going to be shooting video as well. The camera came with a 32 GB 400x CF card, which writes at 60 MB/sec. I've also used 200x cards in the D800, which write at 30 MB/sec. Does using a higher rated card, such as a 600x card (writes at 90 MB/sec) help in reducing rolling shutter artifacts, or do you want a card that writes faster to keep up with high speed shutters or image buffering? I'm primarily asking this question about video tho. Will using a card that writes data faster help control rolling shutter, or is that a flaw of using DSLR cameras for video? Also, since the camera came with a CF card, I'll be buying an SD card for the extra card slot. Why are CF cards more expensive than SD cards tho?