Since you have $600 to play with I would definately look into a remington 1100 or 1187. I bought a mossberg 500 pump a while back. Its a great gun for 200 bucks, but then a friend of mine gave me a remington 1100 that was beat to heck and siezed up from corrosion. Well I got it cleaned up and now I hardly ever use my Mossberg. Well I will use it for deer with my new slug barrel but not for dove and clays. An auto loader is the way to go