I've got to ask... what is your interest in the iPhone 6? Hardware and spec wise its so similar to the 5s. Is it just the bigger screen size? What do you do on it where you want a bigger screen at the expense of pocket / walking comfort and 1 handed use?
The biggest bump in hardware capability between the iPhone 6 and 5s is the GPU. And in the GPU benchmark below you can see its a MUCH smaller jump than we typically see in a new iPhone launch. Which is made even more surprising because its got the advantage of a much bigger case and battery to fit in more powerful hardware. For what you are paying, it just seems like a rip off.
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Tom's hardware has a more detailed comparison and the 5s screen is much much much better color accuracy, better speakers, better GPU performance for open GL applications. And those are just the objective measurements. This is personal but for me at least the size of the iPhone 6 is off-putting.
http://www.tomsguide.com/us/iphone-6-benchmark-results,news-19584.html
I'm curious to hear your thoughts and opinions... but say you really wanted a large screen phone. When the 5s was released it beat out the Galaxy Note 2 in most benchmarks. Think about that, the smallest smart phone, beating out the largest smart phone (not released at same time but co-existing in the same generation). I would expect the iPhone 6 to trounce the Note 4, but it doesn't even come close to the Note 3! To buy the iPhone 6 I would just feel like i got scammed! The wait for a 6s if you want the bigger phone seems like such a no brainer to me. Again, let me know your thoughts, I am not meaning to sound like a git ; )