The best advice I could give, from an artist's point of view, is to look at the 10th generation XRS wheels, and choose custom rims based on principles applied to them:
Notice that its spokes extend all the way to the bead lip of the rim. This design principle visually enlarges the size of the wheel, which is good for the effect of filling up the wheel wells.
Note also the cleanness of the design. It's a 5-spoke, and should you consider aftermarket rims, 5- or 10-spokes work very well with the shape and curves of the 10th generation 'Rollas.
Consider getting rims with a powder-paint coating on them, also. Clear paint over machined aluminum will degrade after a few years, at least in some spots, and those spots will become an eyesore.