If you are doing it to improve them because they are marked, then re-do them anthracite. It will improve their appearance and will help if you decide to sell the car.
If you want a colour change and you don't like black, white and want to move from anthracite, that doesn't leave much (silver, but on a Cup?).
I am assuming they are OEM wheels? If so, don't change the colour
If you are paying for a refurb, maybe hold out and look at getting a different set (which you can then change colour on which works better).