how are you planning on keeping them? if free range i DO NOT recommend shavers. They are the biggest pain of a chicken in that situation as they will spend all their time trying to get into your house rather than searching for food. Myself & two other friends have had the very same issue, i believe it is apparent as they haven't learnt to find food properly as chicks. I suggest orpingtons, they seem to lay well & get the picture when they are not welcome. I also have silkies & they seem to lay ok, i don't believe there are better layers than shavers but mine ended up in the pot as we could not put up with them anymore so their egg production dropped dramatically.
cage birds use shavers, free range i think the orpingtons are best as they also can't get their big buts over the fence & into our garden which the silkies easily clear.