I've used all but 30gb of my 2012 Air's storage, of which 50gb is music on iTunes. I'm thinking about getting an SD card and essentially using it as an expansion, keeping it in most of the time and keeping my iTunes library on it, in which case I'll have as much free space as I need. I've seen 128gb cards available, so I might go for those; does anyone have any tips as to how fast the card should be or which brands/types to avoid? Also, If I wait another few months or so, is the price on one of those going to drop enough to make it worth the wait? I'd like to go for the 128gb card since I'd obviously like not to have to do everything over again once I surpass 64gb.