My very oldest light that I still own is a black 2D Mag that my father-in-law gave me for Christmas about 12 years ago. It isn't perfect, but it doesn't look horrible. If you are that concerned about scratches, get something like the Dorcy 3D Super 1W that is covered about 80% in rubber. Or just get a new one every year or so. They're only like $8-$15. After a year with good use, you've probably spent hundreds of dollars in batteries so picking up another light shouldn't be out of the question.
On more customized lights, perhaps a Minimag with a custom reflector and a Lux III pill, to me, that's one of the attractions of the Minimag host... If it gets scratched up or dropped or something, spend $8 and you have a new light in perfect condition. Can't really say the same about a Surefire E2E.