Have you heard of the Aloha chicken (nothing to do with Hawaii). A new breed developed by folks in Arizona. They are incredibly heat tolerant and pretty too! :)
You might want to choose breeds also that "tolerate confinement well" if they will not be free ranging.:)
Funny, I have heard more people say that Delawares are mean more than any other breed. I am sure there are exceptions.
I have a combination open coop/run with 12 chickens (4 of them bantam size). There is "technically" room for 14, but 12 seems to be the magic number for me. They take turns in smaller groups rotating out into a tractor and also "free" range for about an hour a day under close supervision due to...