It seems that we are in the same boat. My 5S contract has finished but I'm holding off on upgrading at the moment. The SE has me tempted but I would like to try a larger display but I wouldn't get a 6S/6S+ this close to September. On the other hand, most of the iPhone 7 rumours are weak at best! What I'll probably do is get the 7 or 7+ as a short term upgrade anyway and see how I get on with the size increase. Then, in 2017 is Apple brings out something amazing I'll upgrade to which ever size suits me I think.