Yeah the Sand one looks like the best option... I wish it had been available right away at launch though. I'm a little worried about the White back getting dirty even though I take very good care of my devices. The Black version on the other hand, may pick up finger prints. That's why I was leaning toward Sand if it had been available. It probably hides both fingerprints and smudges the best out of the three.
If the White back gets a little dirty it's not the end of the world or anything but I do like to keep my devices looking as new as possible for as long as possible...