If you get a black one, how will you know when to change it...
As I mentioned above, they darken over time, and almost look dirty. I clean, or re-charge mine every two years to bring the red color back. Supposidly you can go around 50K miles between cleaning, depending on conditions of use...If you weren't anal like me.
I know you were kidding about the black top, but I wouldn't buy one.