iPhone 5 or 5s

In need of an iPhone, I'm debating between a 5 and 5s. The 5c is out due to a 32GB limitation. Since Apple discontinued the iPhone 5, I can't help but wonder how it will run iOS 8 (or beyond?). The 5s is quite steep for an unlocked, and I really don't want to wait until the iPhone 6 comes out for prices to drop. Any observations on the differences between the 5 and 5s and its future?

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