When I rebuilt my rear suspension I decided to rebuild my brakes too. While I had everything off and taken apart I took the time to get the calipers sandblasted. I had previously tried to do a DIY job with angle grinders and wire brushes but after 1/2 seasons the rust came right through. Simply tire does a good job but in a few seasons the rust will come through. Clearly the sand blasting route is more difficult but it is the only way to ensure they will last for years to come.
Calipers after sandblasting:
https://drive.google.com/file/d/0B8p...ew?usp=sharing
After painting:
https://drive.google.com/file/d/0B8p...ew?usp=sharing
Mounted on car:
https://drive.google.com/file/d/0B8p...ew?usp=sharing