I'm looking for a universal phone mount. I currently have the iPhone 5S and with the rumor of a larger iPhone 6 coming in a few months, I don't want to have to buy another mount for 40-60 bucks. I also use the Apple iPhone case - its very thin, so it doesn't add much to the current dimensions of the phone.

It doesn't have to be waterproof. I will need access to the lightning port so I can wire up an external battery if needed.

What does everyone suggest?