128GB - 64GB would be enough for me 90% of the time, but I like to take plenty of movies / TV Shows with me on vacation so I got the larger size for that (plus it was only £80 more )
16. I was kind of in a position of not being able to wait for the larger capacities to be in stock. It isn't that restrictive; I just need to be a little more conscious of apps and music that I'm not currently listening to/using, respectively.