So my iPhone 5 is having power button issues (you have to push it very hard to get it to lock). Since I have AppleCare I'm going to get it replaced soon, but I have realized that 16gb is just not cutting it. Has anyone been able gone in on a repair and paid the difference for a bigger model? I mean I guess I can deal but was wondering if Apple allowed it or maybe the apple store would allow me to pay the extra hundred and give me a 32gb model?