Don't know about the Brahma's or Jersey Giants as far as quality, but the Jersey Giants have a reputation of being very slow to grow, thus costing you a lot more feed for the amount of meat. If you want a black bird for your black and white pen, I'd consider the Australorp. However, you might consider an all-white pen and get Delaware to go with your others. The white birds make a prettier carcass as they don't have the dark pen-feathers. The Dominique, Barred Rock, or Silver Laced Wyandotte are the only others I can think about that would fit your black and white theme.
I don't know the genetics to know what a Columbian pattern Light Brahma rooster and one of these barred or laced birds would produce color-wise.