I have both Black Copper and Wheaten Marans. My Marans are not at all flighty or aggressive. My Marans lay large eggs in good numbers which are a dark brown.
I have no experience with Welsummers, as to my taste their are better alternatives.
Easter eggers are ok but generally have a less than...
I assume that in your urban situation that roosters would not be desirable? In which case you would be best to order sex linked chicks? As an alternative I would suggest that you find some local breeders of the breeds of interest and obtain started pullets in the breeds that you desire. You...