In reference to your question regarding picture storage, as Qarik said it depends on your memory card. I'll add that it also depends on the quality you are shooting, for instance I have 16GB card in my D700 and shoot "RAW". I should get somewhere around 800 images on the card. TIFF you can almost half this number, and JPEG images will be in the thousands. Again it all depends on your Compact Flash Card capacity.