Since you plan to let them free range, I would not get a crested bird like the Sultan. That crest can make it a little hard for them to see predators. The others would go great together. The Sultan, while smaller than the others, would also mix with them well but the predator thing would bother me.
My Delaware are fine. They are the ones that have the most curiosity and are the ones that try to peck the paint spots off my work shoes. They are more attractive than I thought they would be and lay some nice brown eggs. My only rooster is a Speckled Sussex. My two Delaware are both pullets.