I'd stay away from pure breeds and go with hybrids. They don't live as long as pure breeds (3-4 yrs on average, compared to about 6 for pure breeds) but they are very hardy, resistant to disease and are very good layers. I've got 6 mixed hybrids and get 4-6 eggs every day, even through the winter when most pure breeds either stop laying or slow down.
When they stop laying they will be replaced and go in the pot - if you want to have replacements on tap then make sure you have a decent cockeril, these can be pretty noisy and aggressive though, so be sure you get on with your neighbours.