I will most likely get the 16GB. It is what I've had for each iPhone, and I've been fine with it. As far as color, I am still undecided. I've had black for each iPhone. I've never has a white one. As Booyow said, I may change it up this time around. I'm not sure though.
What about mine? Just kidding! Yeah, I have to agree the black has always looked stunning. And, now that I think about it, the white may be bad for my eyes. As I read someone say earlier on another topic, I already have the Macbook Pro which is silver, close enough to white. I've always had the black, so why not stick to what I love?