Blue would look hot. I don't think black would go too well with it. It just wouldn't stand out enough, which is why I haven't bothered with my car. And yeah, as Spoon said, lower the car first, will make a bigger difference. Also note that I would go a metallic blue (or purple, although I'm not sure it would suit your car color), like the spoons above. A block blue would look pretty lame. If you were to go block colors, perhaps red or yellow. Also note that the centre of the oem calipers are hollow, meaning you'll need to paint the pad covers as well, or else it could look a bit odd.