I have a lovely flock of 6. One rir, one Long Island red, two speckled Sussex, two barred rocks. They get along well and have very little drama. They're so sweet to each other I have trouble figuring out the pecking order but I think my rir is lead hen. I'd like to add to the flock in the spring but I don't want to mess up the nice Dynamic we have now. What breeds would you recommend to go along with my sweet flock?