I would strongly recommend the Benelli Nova http://www.benelliusa.com/firearms/nova.tpl
They have all the bases coverd. you can shoot steel shot out of them. They come with 3 different choke tubes; Improved cylinder, Modified Choke, and full. You can't shoot steel out of the full choke. You also have the ability to shoot 2 3/4", 3" and 3 1/2" Magnum shells if you choose too. they are available in both 12 ga, and 20 ga. They also have a recoil absortion system that you can add to the stock for about $90.
I've shot alot of different shotguns from a $150.00 mossberg maverick, to my dads $2000.00 Browning Centurion, and I have to admit that i am really impressed with this shotgun, and that fact that the price tag is about $350.00 at the local Bi-Mart.
I've had mine now for about 6 months, and have had 0 reliability issues, with many ducks, geese, turkeys & rabbits succumbing to its accuracy.
http://www.benelliusa.com/firearms/nova-specs.tpl