[jmatta]

Since your car appears to be seal grey, I would match the coloring to the wheel centers (possible a little darker grey, such as a gun metal). Satin or semi-gloss would be my preference, if you wish to go with the black centers.

Years back, I hand painted one of my car's wheel centers with a washable acrylic paint, so I could really get an idea if I liked the look or not...may not be as easy as photoshop, but I wanted to see it in person.