The SD Card that came with my O3DS has only 2 GB of space. My other SD Card (on another 3DS console I own, on which I could never run cfw because it's always been on the latest firmware) has 4 GB, which has always been enough because, well, no cfw and the .cia installations that come with it. Assuming I may want to have more than one game installed at the same time (installing and uninstalling isn't such a difficult and/or time-consuming process, right?) and I'm curious about trying out all three storylines of Fire Emblem if, how much space should I aim for on an entirely new SD card? 8 GB, more? How much do you have?