Ive been talking to my powder coaters. £20 to do both hubs in gloss black. Rims the same but that depends if the anodising is failing. The hubs will probably need to be chemical dipped - another £10 each. The front hub will need new bearings unless old ones can be knocked out without damage which is unlikely.
Wheel build is £60 from Kev Blurton in Derby (one of the few who will do GSA wheels). If he has to strip them its another £90 for new spokes or his time stripping the wheels.