Matching calipers would look great, or if possible, match the body color, not sure how that would hold up under the high heat.
As for the wheels, if you feel you must paint them, leave the rim lighter/natural color, and do the spokes and hub a medium graphite. (just my 2¢). I am not fond of blacked out wheels, they should be clearly visible, those are nice wheels, show them off a bit.