An unfortunate side effect of our current civilization is that there are a lot of fine animals that do not have a fine home. While you could purchase a purebred animal (and there's nothing wrong with that!), there are many fine animals that might otherwise be killed by overcrowded shelters if they are not adopted.
If you can find room in your heart and home for one or two of these animals, you will be bringing a lot of love into your home, and will be helping these animals and the earth.
If you are adopting into a household that does not already have cats, may I recommend that you adopt two? They will be much happier and will keep each other company when you can't be around.