I am new to this so I need a little help choosing the right breed. I have 6 chickens now - 2 adult Rhode Island Reds and 2 adult Leghorns as well as a Silver laced Wyandotte pullet and an Australorp pullet. My wife wants me to order fertile eggs so our kids can see them hatch and experience the whole thing from egg to adult. However, I want to make sure I choose the right breed. I would like chickens that are great egg layers and also do well in Pennsylvania winters. My kids are 6 and 5 years old so I want something that is not too aggressive. PLUS, I want smething other than what I already have! Is all of this too much to ask??? So what do you receommend and I would alos love to hear receommendations for the place to order them from. Thaks!