One of the reasons I considered Sussex is their dual purpose as well as being a heritage breed. I got the Dominiques after my straight run didn't work out well (7/3)!
:barnie
Since you're planning on containing them, consider the size of the run/yard. It looks like your coop and run is about 8'x8'. That's not much room for standard sized hens.
Have you considered bantams? Their eggs are smaller, but you can also house more of them comfortably.