Orpington's. But, if they were crossed with a Buff then that could start showing up as leakage later on down the line. I was doing the B/B/S Australorp's before I switched over to the Naked Neck's because they handle our summer heat over here much better. I had some of those Australorp's from...
I know what you mean about breeding the B/B/S Australorp's and having color's bleed through. You have to know how the back lineage was breed, or you grow-out blue boy's that can have red leakage in the feathering (a no-no) if you want to show them. With white's it's hard to tell what other color...
I was working with the B/B/S Australorp's before, and with what you have there for your cockerel's to pick from if you are trying to follow that way, I would choose one of the Splash boy's. Pick the best acting one between the 2 of those.
Most likely if you were to keep the white one to go over...