I went 512GB. I have a very large photo library (72,400 photos), and a lot of downloaded music (21,300 songs). I could still fit in 256GB but I would only have about 30GB free. Having all of the photos of my life on all of my devices is really nice. The music is important because I drive over the mountains of Oregon quite often with no cell reception, and XM keeps cutting in/out because of the heavy tree coverage. I find having my entire music library on my device gives me plenty of variety.