My leghorn/RIR rooster is the coolest!! He likes to sit in my lap while Im reading a book on the back deck. He "helps" me turn pages too. I think this comes from his RIR side, his daddy was a leghorn n a SPAZZ!!!!
Silkies are sweet...but not much for protection. Ive always had barnyard specials (mutts), and have been thrilled with them. I did have a RIR once, he was a mean man! He moved to a nice big farm. My americanas where opposide from eachother, while they had a nice temperment, 1 was a great rooster, the other was cluless LOL. When Sam died of a mysterious illness, Little Tipps took over...worst rooster I ever had LOL. Im sure others will be along to give more advice!
Generally large heavy breeds are the calmest/friendliest. Cochins, Brahmas and Orpingtons have really good reputations.