First off, I think the blue helmet is *really* pretty. I'm thinking it's time for a new helmet for myself, and I like the design of these. What is the brand?

I have always worn a white helmet so that it will match (or at least not clash with) whatever jersey I'm wearing. I always make an attempt to match jersey, socks and helmet. Do you wear a lot of jerseys with blue in them? Or plan to? If so, I'd go with the blue. Otherwise, I'd go with white. But if you are really drawn to the blue, buy it. Whatever makes you feel good while riding is the right choice.