Well you either just keep them, as most likely by that time they are pets. Find someone with a large property who is happy to take them. Of course the final thing is to um, get the axe out. No good for eating, well I suppose boil them up for a nice stock. Just keep on eye on them as they do get older. Some just look sad for awhile and you will find them dead one day. Remember to check their bums if they are looking quite sad incase they are fly blown (yes I know yucky, but a reality).

If they do go off the lay, make sure they are on good food, try a worming treatment and often they will come good. Garlic in their water, especially on the full moon is very good for them.

As for breeds. Well the bantams lay little eggs and go broody at the drop of a hat. The little eggs can be an issue with baking where you really want a certain size egg. Hybrids, well, good laying, but shorter life. The more traditional breeds will lay for a lot longer (more than a few years), you just wont get quite as many per week. I have a sheet somewhere that lists the better layers amongst the traditional breeds, will see if I can find it for you. I have a soft spot for Australorps, but they are a bigger chook so need more space and food.