Having learnt the things I've learnt about chickens over the last few years, of course I'm going to suggest that you buy free-range or organic. But if you're a little tight for cash, the RSPCA Freedom Food chickens are very good and available in all good supermarkets.
Basic Sauteed Chicken. I've made this three times now. It's the easiest, fastest and best basic chicken recipe I've ever found! I sometimes season it with chicken bouillon granules in place of the salt and it comes out extra chicken-y and delicious!