I am looking to get my 14 yr old son an iphone. It is his 1st smartphone but he has an ipod touch so he is familiar with ios. It would be on contract with AT&T. Currently the iphone 5s is $200/16GB and $300/32GB while a certified like-new iphone 5 w/ 32GB is $150. He has filled about 15GB of his 32GB ipod touch, mostly with apps/games. I would be worried that 16GB would be too small. I would rather not spend $300 vs $150 but it is not a deal breaker. He is not a power user. Basically he texts, plays some games and uses Instagram. Would the 5s be that much of a benefit to him? I don't think he will need the processing power and his picture taking is pretty basic. I do like the extra battery life and fingerprint scanner. How much better real world battery life does the 5s have? So basically I'm asking is the $150 extra worth it in his usage situation? Thanks.