What color to paint my dart?

I chose a different route for my 1975 Plymouth Valiant Custom 4-door ; a Dupont colour for Aston Martins called "Marron Black", which is a dark brown that in some light looks black. I saw this colour on a Vitesse during the 2011 Frankfurt auto show and was most impressed. I don't like the "chameleon" paint schemes but this colour is elegant and understated, quite in keeping with my wish to build a "sleeper".

The original colour of my car was recorded as brown (marron, in French) in the "carte grise" and I didn't want to pay for a new one, preferring to minimise any bureaucratic headaches.