I've gotten a lot of comments on my white K-x, which I wasn't expecting. As soon as I saw that it came in white, though, there was no doubt in my mind as to which color to get. I have to admit, I'm partial to white as I'm partial to Apple.
I just like different style as far as colors go. White is the new black, for me. I feel your pain with color choosing, though, because I have the hardest time choosing what color iPod to get. But if you think you wouldn't really care either way, then I'd go with the black so you can get the 55-300mm kit.