Thanks everyone, I hope they will all be great layers! Have read good things about the Buff Orpingtons laying all year. Not sure about the other 2 breeds. Time to do some research.
I picked up 7 pullets the other day, and don't have much faith in what the previous owner told me they were. Supposedly all 7 months old, but not yet laying. This is what he told me they were:
2 white ones he called Colombians. Looks about right from google images I have seen. Just not sure...