Yeah, paint them. Search on here and you'll see a lot of threads for the corrosion issue on the hinges. Really bad on '07 like mine and some '08s.
Do you have rock chips on the hinges and not on the surrounding doors?
Then what you really have is corrosion. The hinges are badly or unprimed aluminum and the doors are steel. From your post I assume you know the problem with dissimilar metals.
You can go SS if you want the shine, but it's not necessary. I just repainted mine with some rust-o-leum bedliner and haven't had a problem since.
edit: I also primed and painted the area under the hinges.
Do you have rock chips on the hinges and not on the surrounding doors?
Then what you really have is corrosion. The hinges are badly or unprimed aluminum and the doors are steel. From your post I assume you know the problem with dissimilar metals.
You can go SS if you want the shine, but it's not necessary. I just repainted mine with some rust-o-leum bedliner and haven't had a problem since.
edit: I also primed and painted the area under the hinges.