I've always had good luck with the Remington 870. I know it's not an automatic, but I've been shooting three gun with it and not very many people are that much faster or more accurate with it than me. It's an excellent gun, put together well and can serve you for years to come. Plus it's cheaper and you can spend all the money on practice. But then maybe I'm just ridiculously talented along with my dashing good looks...
and rugged charm