I always used to have cases and screen protectors on my phones, and inevitably I'd take them off near the end of the phones life and regret that I'd spent money on a nice sleek piece of kit, and then covered it up with a rubber/plastic monstrosity.
So this time I'm taking a gamble, and not using any case. It felt really precarious at first, but I'm a reasonably careful guy, and rarely drop my phone. This decision might come back to haunt me though. Only takes one fumble!