My Monaro is metallic black. I chose that because the only 3 colour options were very bright red, silver, or black, and:
- red is a red rag to a donut-eater

- silver just made the car fade into insignificance
so black it was.
Now, I knew it was always going to look dirty within 5 mins of a wash, but the real trouble is, unless you polish it every time you wash it, it still looks cack. I've tried all sorts of shampoos and polishes, but even a good wash with Autoglym followed by a decent leathering (ooerr) still leaves drips and streaks which you can only get rid of with polish. And clearly, polishing it every time I wash it just isn't an option. So, something to bear in mind.
Also, Moonie is always a popular colour with the buyers - depends how long you intend to keep it. Have you thought about Moon Grey with more mica in it? Carl has suggested that for mine - going to try a test panel to see how it looks. Apparently some of them came out of the factory like that and it shows up more of the brown-ish shimmer on the paint.
(Oh, and the other downside of black is that if a pair of donut-eaters are about to finish a "frame", they'll be looking for a black to "pot".....

)