Black or White Kindle?

I was given a 3rd gen kindle 3g/wifi for Christmas in graphite (black). Although I love it, It's hard to see the lettering on the keys in low light conditions. My wife just got the same model in white, and man what a difference. The key lettering is much easier to see, especially in low light conditions. Unfortunately, the white kindle does not seem to be an option for the wifi only version, just the 3g/wifi. She bought the special offers version at $139.00, and the ads are completely unobtrusive, being displayed on the screensaver and at the bottom of the home screen only, not during reading. I recommend this model!