another option is powder coating... we do a TON of calipers... fresh rebuild and they are better than new, and look great! i upgraded the rotors as well, the truck brakes like a sports car now!
here is how i did mine
pulled off the old
chem tank, outgass, and blasting
primer to smooth out the casting marks
new rotors coated
freshly cut (barely to remove coating)
few drops of anti seize...