If you can wait for the 7 Plus to come out then you might as well wait. We aren't sure what to expect from the next generation of iPhone yet but I'm sure we'll see a redesign and
hopefully a smaller bezel. Just as @Just_Me_D stated, you can't have your cake and eat it too. If you want a bigger screen and better battery life you're going to need a Plus which can be cumbersome every once in a while but generally works great for me. I've never regretted getting the bigger device and I've had a 6 Plus and 6s Plus.
Good luck with your decision! Let us know the outcome.
