My browns and buffs are all Holderread lines and the whites I just purchased this year from Strombergs. That was the only place I could find selling whites. I had contacted a couple of private breeders but didn't have any luck there. So far the whites are not looking quite as heavy as the others but they still have a lot of maturing to do and I am anxious to see how they turn out.
I am not sure who raises whites, they are really rare. I raise brown africans and my main blood line is from roger stanford. It looks like you will have some very nice browns and buffs when they grow upt. The whites might take a little work but its a good start!