My vote is for silver - I love this colour and can't believe M dropped it from their standard line of colours. I believe a fellow HH has a room of high end silver DSPs, including 8Ks at the front which look awesome. I think it's a colour that never looks old or out of place and definitely doesn't show the dust as much as black or the other shiny finishes.
That said I'm not sure what colour other than graphite would blend in with your centre

. A tough problem indeed if you want a change!
As a final thought... if blue is leading then take a look at the liquid blue of the new 2016 Ford Focus RS demo model. It's an aggressive but sophisticated look - again gobsmacked that the manufacturer is not actually releasing it in this colour!
Happy choosing although I know if you're anything like me this decision will actually be driving you crazy!