Of all the discussions I’ve seen about the X, no one really asks about capacity. I currently have a 64 GB iPhone 6, and have never come close to filling it up. I use iCloud Photo Library and Apple Music, so the two big storage hogs are taken care of.
The price difference between capacities is enough to seriously consider, I think. Part of me thinks 256 GB will be good for the 4K video footage and Live Photos, but honestly, how often is 4K video shot and iCloud Photo Library takes care of that anyway.
Will probably go through a telco, otherwise Apple’s 0% financing credit offer looks good too.
Edit: almost three years later, and I’m only using ~30 GB. That surprised me. iMessage for iCloud (or whatever it’s called), when released, will free up a few more GB. 256 GB might be overkill.