If you have an mp3 player of some sort, see how much music you store on there. If not, just check how much of your computer space is music. If most of your space will go on apps, then it really depends if you do games/new/books or whatever!
So like it really does depend on you and your needs. Obviously go for the best you can afford, but no point spending money on GB's you wont use!
But 16GB seems to be plenty for many people that I know.
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