I think I want to start with the white leghorns? From what I have read they appear to be good egg layers. The kids are going to want to see some results from the chickens too!
After that, maybe next spring if all goes well then I might consider getting a more fancy looking one.
For now I think I will be getting an older chicken. I saw that some places have 17 week old chickens that you can get. I will also be visiting some of the local farmers to see if they have any. I dont think the kids or myself are ready to raise them from chicks until we know more about caring for them.