I just have a simple Black front, Navy Blue back, blue buttons. Simple. I don't like a case but their is clear cases and bumpers, and even if you choose to use a design case for a little, yours is still under it. Why buy a limited edition console or handheld design, well because it makes the device special to you.
I don't sell my phones, pretty much every single phone i have had, I still have it. I only get a new phone when my past one is outdated and slowing down, with the Moto X's optimzations, and the new trim thing, i imangine having it for a while. And as for the engraving and stealing, if you / police do catch the theif, or if its taken by a classmate or something a little less drastic, you can prove its yours.