I think that helps settle it. Based on all the replies, I think we'll go with the Australorps. It can get really cold where they are housed, so the heavier breeds will probably do best. fair amount of shade in summer time with the trees, so it shouldn't get too bad.
We've got 3 Orpingtons, 2 EEs (hoping they are pullets...we'll see ). In spring, we're looking to get Black Australorps, Welsummers, and Partridge Wyandottes. Our primary concern is overall "fun" and the flock has to be able to bear confinement well (we've got a coop and a fairly decent sized...