I've owned silver colored MacBooks going back to my titanium Powerbook. I bought an Air the other night— and THIS time, I wanted something different, darn it! I went with the space gray and I'm very happy with it. I don't think finger prints are too much of an issue given I've got microfiber towels all over the place.
That said: the Starlight is freaking GORGEOUS. On the way home from the Apple Store, all I could think about was how good it looked. I selected what I selected because I had made my mind made up a long time ago when the buying process began, and I wasn't about to make any rash decisions on the eleventh hour. But when I saw the Starlight in the flesh (so to speak), I was damn impressed. NO pictures or videos do it justice. It's really subtle. If you can look at one in person, you should.