Take the 5S and run with it. 16GB isn't much, but managing it is easy. Just make sure you back stuff to iCloud, put them on iTunes, etc. The 5S' iSight Camera is significantly better than the E. You're going to get a better user experience w/ the 5S as well. It will give you the best software support out of any phone at that price range through Boost. Tremendous build quality as well. Don't need Sprint to send out updates either.