I'm getting a phone upgrade this year, and I'm not really sure if buying an iPhone 5S is worth it now. I live in Serbia, and the price of a brand new iPhone 5S is 45.000 RSD ( 399USD, 363EUR). My next upgrade will probably be in late 2018-early 2019 and I know there's no way for it to be supported until then, but at least iOS 10 would be nice. Is it worth buying the 5s now or should I wait for the iPhone 7 to come out this September and possibly snag a new iPhone 6 for about the same amount of money as the 5s now?