Apple's iPhone 5 is rapidly approaching its first birthday, so speculation about Apple's next-generation iPhone, dubbed iPhone 5S or iPhone 6, is hot topic right now. Here, we ask whether or not it is worth buying an iPhone 5 now or waiting until Apple launches a new iPhone (or two) later this year.Related StoriesiOS 7 beta 4 contains key evidence that iPhone 5S will have fingerprint sensorWhat does iOS 7 tell us about iPhone 5S, iPhone 6?