I'm surprised at the Jersey Giant comment, my one Jersey Giant was the only hen out of 10 I had that went broody and did so twice within a year. That said she was laid back and friendly, albeit talkative. Currently I have one JG chick and she seems just as mellow and laid back thus far.
Easter Eggers and Favorelles are both good breeds, I'm partial to EEs just because of the randomness of colors in birds and eggs, but both are great. I haven't had any experience with Welsummers, but have SLW, 2 GLW, and 2 Columbian Wyandotte chicks, they seem to be very bossy thus far (especially the one SLW as she's the oldest and the biggest and currently the boss chick) but they might mellow out when they mature.