answer:How many photos and apps will you be putting on it? Personally, I’d get the biggest one I can afford so there’s no worries about that. Now, a few GB can hold a lot of photos. Still photos are only about 100K or so, so you can store thousands per gigabyte. Videos and MP3s, on the other hand, gobble up memory like mad. And say ‘hi’ to Siri for me :-p