I went with the 64GB. No brainer as I had a 64GB iPhone 4S for 2 years (and in fact upgraded from the 4 to the 4S back in 2011 partly because there was a 64GB model). I have a large music collection. I have lots of apps that take up space, I take tons of photos, I shoot a lot of 1080p video which takes up lots of space etc... In fact I was disappointed there wasn't a 128GB model this year.