I'm partial to a mixed flock myself, they're SO much fun! The only problem is trying to figure out who the dads are when hatching chicks because I always have more than one roo

Next year should be easier, though - the two boys I'll be using for breeding then are completely different from each other. One is part ameracauna, part blue australorp and either part black australorp and/or FBCM; the other is half light brahma, half buff orp. I like hatching mixes - my last two hatches produced a total of 3 white chicks and I don't even know how because the parents are both black! (Both parents have the blue feather gene as well as whatever colour the ameracauna grandparent/great-grandparent was.) I also had one green egg-layer (if it's a girl

) hatch out of a brown marans (part marans, anyway) egg!
Personality-wise, I also like the variety. Depending on how many you have, you might find that they all split up into their own smaller groups, each with differing personalities/behaviours. Makes for really good chicken tv! One of the best episodes I ever watched (of "chicken tv") was when a white phoenix (a bantam) roo I had mounted my black australorp (large fowl) hen and she wanted none of that.... Well, he kept right on doing his business as she was running away with him still on her back!