I think that the concern about the file size of the D800 images is overblown. Raw files will be about double the size of the files produced by the D200/D300 type of camera. So if one pretty well fills up one's card shooting with the current camera perhaps one would want to buy more cards (and perhaps bigger cards). Unless one is a professional sports shooter or otherwise expects to be shooting extremely large numbers of images I do not think that one will be short of file space on the cards. I have never come close to running out of space shooting with my D200. I will review the total capacity of my cards and make a decision about adding to them but I doubt that I will find it necessary. Just compute your likely needs and see how it works out.