Here is my .02 cents on color.
Black is nice but too hard to maintain. Had a black Accord and by the next day after washing and waxing, you could see a thin layer of dust that settled overnight.
Silver is nice but I noticed that it's the current trendy color. A little while back, black was the "fad" then white, and now, I think it's silver. Even the Acura brochure all display the silver on the cover.
But I must admit, the silver X looks sweet.
It's a color that doesn't draw as much attention as the other colors in that it blends in. Also, this color is somewhat different since it's not your basic primary color. I guess you could say taht it's a color that you can be "conservatively different."
By the way, silver is definitely easier to maintain than granite green.