There is something to be said about tradition. When I was in Switzerland and got a engraved Swiss Army Knife, even though they were offered in other colors like white and black, IMHO the only option was red.Seeing the Space Gray color out there, it just doesn't 'read' as a Mac to me. It's nice, but not a big enough change from Silver... I'd like a completely black better I think.
There's something weird about these new Mac designs in Silver... I like that.