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IMO, I'd stay with the factory gray wheels. One major advantage to them, in addition to looking great, is that they will hide brake dust. I think black wheels would actually show more dust & dirt.
I'm rather glad I went with the brighter, silver wheels -- after I managed to curb (2 separate incidents in the first week or two) 3 of the wheels, the shiny metal didn't show as badly.
This was part of my official criteria when deciding back when. In fact, the Get Amped vehicle curb rash was on the grey wheels and I inspected them to confirm that the grey is surface applied (and hence a brighter silver is revealed when scratched).