I went with the Amethyst color Surface case.
It really changes colors depending on how much light strikes it. In low light, it looks nearly black. Slightly more light, you'd think it was blue. In bright light, it definitely has a purple tint to it, but it's a very cool overall effect. Definitely not too purple! (top photo was with a flash, so the photo had very bright light. In reality, the case doesn't look nearly that purple)
Really appreciate that Seidio provided a cut out to display back notification light. Case has the soft touch paint finish, and adds very minimal amount to the size of the DNA.
I also love that Seidio kept the curved form of the back of the DNA... fits snuggly in the palm of my hand, very secure, and allows the DNA to feel thinner then it's actual size, because of the way it tappers towards the edges!