I shoot max resolution and save both RAW and JPG to both slots (for backup). I have half a dozen SanDisk Extreme cards in 32GB size. They are getting cheap. Just one note of caution - only buy from reputable sources as memory products are frequently fakes. Especially on eBay. The most common problem is re-programmed cards that report a higher capacity than they actually posess. When filled beyond their actual capacity they will overwrite and corrupt earlier files. And in a camera you will always trigger this condition eventually if it's there. I ALWAYS test new cards with a free Windows utility called H2testw. You can get it from www.heise.de/download/h2testw.html. Don't worry about the German language. The opening screen has an English option.