The Verizon website made the choice for me, as only blue was available when I went through my account to order.
The longer story is that at first the phone didn't come up at all but when I went back an hour later both versions of blue were there. This was going in through upgrading on the account, not through the landing page. When I went that way it wouldn't let me transfer the upgrade from one line to the other.
It should have blue and white boxes beside the phone on the website. Just click the white box to get the white version. Atleast thats how it is on mine