All of our chickens are nice. LOL! I think almost any creature you put a lot of time, energy, and love into will be fairly tame (that said, I have three americxsilkies who would be happy if they never see me again.. even though I am the treat bringer! ARG!)
My vote goes for bantam cochins, also. What super nice, cuddly chickens they are!! fluffy and cute! They are sweet and calm. Start with day olds, that way you can hold them and talk to them a lot (I think this is the prob with my mutts listed above.. they spent their first 3 weeks completely free ranged with Mom (as in.. no human interaction whatsoever).
That said, my ds (6) has his own Barred Rock, who is the most outgoing and friendly in my big girl flock (he held her all the time as a chick).
Meghan