I didn't get a case for my Palm Pre when I had it. While I was walking my dog I dropped the phone and put a sizeable scuff on one of the edges. Things like that really bother me. On my Lumia 900 that my daughter is now using the bezel is scratched to **** but aside from taking steel wool to it and giving it the brushed metal appearance there isn't a whole lot I can do with it. For a while I had the plastic on the chrome, minus the camera lense, and it kept it scratch free. Wonder if Brasso would do anything for it if I taped off the rest of the phone and polished that part.
Regardless of how well you take care of your phone, the screen is glass. Glass is prone to scratches, chips, and breakage. All you can do is handle the device as carefully as you can and do all the safeguards like using cases and screen protectors. The only reason I'm not doing any more with my Lumia 920 than I am right now is because I don't see anything official from Nokia. Once I see official Nokia cases and accessories I will act on it.