There is a F-Body upgrade thread on ClubGP where someone was showing their polished calipers:
ClubGP Message Forum troubleshooting
As for painting them, I have never had any issue using regular rattle-can paint. I always have folks insisting that high-temperature paint is required, but I have painted about a dozen difference cars' calipers with regular spray paint and they all hold up just fine. I will agree that powder coating will hold up much better than any paint job, though!