Any suggestions as to the best SD card for the X2?
Is there a larger capacity now, or soon to be, available?
I wouldn't worry to much about what class card you pick up. All your going to be using it for is music and pictures most likely, even a class 2 card can do that without a hiccup
Where you will definitely notice a difference in the various classes are the speed at which you can copy files to your SD card though. A class 6 will def be A LOT faster copying files over than a class 2, but other than that there is virtually no difference.