I expect you've probably made your mind up but I just got my frame and a sett of wheels done in gunmetal. I'm really pleased. Its Pretty much same shade as on the new Diavel X so I can claim its a Ducati colour! Its for a 900SS that will be a half faired superlight - a - like in Red.
I ended up with a shade of Grey I liked and which I think will work well with the red Tank etc. Nasher