I'm with Diamond on this one. Just enough machined/billet or chrome items to compliment the black bike. I prefer machined/billet over the chrome, and will probably have my speedo housing black powder coated this next winter, along with my floorboard pans.
My first two bikes I chromed out big time. I spent many hours cleaning and polishing all that chrome.
'09 Kingpin 8Ball
'06 HD Road King
'06 Vulcan 900 Classic