Go for fluorescent green, it will illuminate at night and look good.
Just buy the real thing. Foliatec caliper paint kit. Its suposed to last and resist extreme heat. Ive bought it myself.Eeahhh.. Silver all the way, as they come from the factory.
Non of the boyracer colours keep it as you bought it ..
If you paint them the paint will eventually come off in places and then look a mess...