I agree re breed if you are after the eggs mainly - RI/LS cross. Some of the crosses have their own name now, such as Goldline and Lohmans, which are pretty much the same. I have kept all of them over the years. they lay brilliantly but don't tend to live as long.
If it's long-lived but fewer eggs that you want, cream legbars are very good. Bantams are wonderfully funny, but tend to go broody frequently, when they can be quite ferocious for a puffball! So funny though. They also moult and so lose time laying then as well. As can many other breeds, although the cross breeds don't tend to spend as long in moult. I had araucanas that always moulted in cold weather. Keeping them warm and dry in freezing temperatures was a nightmare.
If you have a broody chicken, you may want to have a small hutch with loads of ventilation to keep them in, as they tend to disrupt the others and can put them off laying.
It's great though, I love having chickens. I go for cross breeds in one pen and pure breeds in another. The cross breeds tend to be more docile and let you pick them up quite soon after you have got to know them - I sit in with the newcomers for quite a while until they are settled, to show that I am their protector and the real boss, no matter what the other chickens may think.