Get ready for a headache....I'd 100% wait for the 5S which hopefully utilizes a different build technique along with better materials.
Both the Black and White models are still shipping with a variety of build issues ranging from...
Scuffs, scratches, dings, etc on the chamfered edges or sides.
Scuffs and scratches on the rear plate.
Sunken in power button.
Visible hairline scratches on screen.
Noticeable warm or yellow screen temperature.
These issues are still very much still existing on both the white and black models some 6 months after the launch. I went through about half a dozen black iPhone 5's at Apple when they launched, then went through 3 Whites when I said forget it with the black. So a total of 8 phones just to find one that had no real visible signs of build issues out of the box.
Now 6 months later I just went through 4 white models with Tmobile in order to find one that didn't have noticeable issues out of the box.
And even more proof is that my brother just recently used an upgrade for the iphone 5 on at&t and he also went through 2 phones at Apple to nab one that wasn't dinged or scratched up. His first one had a crack in the camera lens out of the box and the second had a ding by the power button and multiple scratches by the volume buttons. His third one which he has now even had a small scratch on the rear near the Apple logo but he said he really didn't feel like trying another and just popped a case on.
Point is why is this still happening some 6 months later?