Others have already mentioned the other breeds... but I thought I'd comment further on Anconas.
They are more 'flighty' and high strung than the other varieties I have. I have three of them and have really grown to like them. They are sort of the "watch dogs" of my chickens: Anything that comes to close (or comes into the coop) they start talking and alert the others (My daughter calls them "talkies" instead of anconas). I have two 'normal' colored anconas (mostly black with white spots), but one is 95% white with just a little black in it.
I was getting (until winter days got shorter) about 2-3 eggs per week from each ancona. Their eggs are medium size but edible (I have some silver spangled hamburgs that I call my "Pigeons" because of their shape and also because I'd swear the small size of their eggs are about as big as a pigeons!)
I just got x2 white rocks last night (were less than a day old) so I can't comment on their laying, but I do have a Barred Rock. She lays about 5 eggs/week. She is one of my favorite hens, very personable.