Everybody loves recommending a brand, but the truth is that the shotgun should fit you. If it doesn't come to the shoulder somewhat "naturally" and "easily," buy a different shotgun! It should natural when you bring it into a shooting position.
I have a Mossberg 500, and a Mossberg 835 (the actions are pretty much exactly same), and I like them both. They are dependable and rugged, and they fit me really well. I can look down the length of the barrel with minimal adjustment, and that makes them keepers.