Lots of great suggestions. I've heard lots of good things about both breeds you've picked; mainly for egg laying, I would guess.
We'd be able to help a lot more if you tell us what general area of the world you live in, so we have an idea of your climate.
This can make a big difference with what is recommended.
What kind of predators do you have? (You have them, even if you don't think you do. They may be raccoons, dogs, hawks/eagles or wild predators).
Do you plan to free range in your back yard? Is a rooster permitted in your yard?
How many chickens do you want, and you REALLY think you won't get more? They are addicting.
And @ejcrist
is right. They are SO MUCH FUN.