my brother had his sprintstars powdercoated about 2-3 years ago and they came out nice.
as for my KPZ wheels, after i got those sandblasted, i filled the seams, had 2 coats of primer applied, a black layer and a silver layer and a clear coat. i thought that they finish on them looked the part
if keeping the costs down is what you want, i'd have a silver coloured zinc paint applied.