How old are your children? I would probably stay away from roosters right now and just stick with hens. Most hens will either be friendly or could care less about you... either way they usually arent agressive unless they are protecting chicks. You can get a mix of different breeds to find out which ones you like best. If you are set on having a rooster, then get a bantam (miniature) breed rooster. Silkies and cochin bantams are known to be gentle (there are always exceptions though). And bantams are a lot less scary to little kids... Roosters are very scary when they are so big they can meet a child eye-to-eye.
oh and for large breed hens... I have had Buff Orpingtons, RIR, Barred Rocks, Sex links, Easter Eggers, Light Brahmas and mixes. My faves are the Brahmas and the Orpingtons.