I always felt that painting stock calipers RED scream "LOOK AT ME!! I HAVE SMALLISH STOCK CALIPERS" vs the Brembo calipers which state "I HAVE EXPENSIVE HIGH PERFORMANCE BREMBO CALIPERS. DON'T HATE".
And I feel that black is very sedate. Almost imperceptible from more than a few feet away. I've gone the route of cleaning, wirebrushing down, and re-spraying with hi temp chrome (which actually comes out to be just a very bright, clean, silver color) to be what works best for me. Adds an overall "clean" look to the entire area