You may regret the RIRs. They are sweet to people, but don't always 'get along well with others;. My experience (granted, it was just a couple, so ) was that they were very bossy to the others - quite a difference from my BR girls who are pretty even keeled. (Think more like Aurora's personality) That said - only 2 in a flock your size, there is far too many 'others' for them to reek too much havoc (except at roosting time - which we shouldn't, as mere mortals, watch anyways!2 barred rocks, 2 Rhode Island reds (most adventurous/inquisitive of the group) and an australorp.