You might consider birds with ample combs and wattles, to help dissipate the heat, too. My black australorps do better than my Ameracaunas, but my BAs are heavier birds, which can present its own problems.
Availability of deep shade on a continuous basis, plus, wetting down some portion of their ranging area daily can help mitigate some of the heat issues.
As said by others, big combs and wattles help dissipate heat. Clean feet are also good.
I love Leghorns, they come in all kinds of colors, lay like crazy, and are flighty so a bit better predator resistance especially if you get dark browns (those are the flightiest of all of the ones I have tried. I even had one successfully hatch out chicks in my predator filled area)