I was on the fence between the Pacific Blue and Graphite. Ended up choosing the graphite and when I went in to pick it up at the Apple Store, I was able to compare all the different Pro colors. I had no regrets about getting the Graphite. The Silver looked very plain to me, the Gold was nice, but the back was very beige in color. The Pacific Blue looked very good, but I think I would get bored with the color after a few months.
The Graphite looks really sharp with the Deep Navy case.