Which breed to integrate with my leghorns¿

[Osburnsa]

My tiny little flock consists of 6 White Leghorn pullets (and 1 Silkie but she isn't kept with the Leghorns.) I'm looking to add to my flock, & there's a local guy who raises Rhode Island Reds & Barred Rocks. I'm looking to get 6 more chickens. Which breed would you suggest I get to integrate with the leghorns? Or should I get 3 of each? And is there any easy way for me to sex them as babies? I wouldn't mind a roo, but I don't know what I would do with more than 1.

 

[Den in Penn]

Either breed is good. My grandfather had Rhode Islands and Leghorns in his chicken house. I have had Bar Rocks and Rhode Islands in my flock at the same time, as well as others. No easy way for you to tell the sex of those chicks, without some training.