Wish I could contribute to this one, but currently I'm just a rifle and pistol guy. I have a 12ga SXS back home that I inherited from my Grandparents, but it was kept in a closet and not maintained since my grandfather died (over 14 years with no care) and I've been told that its not safe to fire. I'm going to bring it back when I go home for the holidays and consult a gunsmith or two to see if it can be brought back. Don't know what it is exactly, but it was called, by an employee at a reputable gun shop back home, a "Sears Special."
Good news is this was one of the guns I inherited that got me into shooting. Not including the 5 weapons I got after my Grandmother died 7 years ago, I have six more rifles and two more handguns now. So even if it becomes a mantle piece, it is still a good gun in my mind.
After I blow a few months of gun budget on my AR build, I'm looking at a Mossberg 500 series something. I like the big aftermarket for these shotguns, so I can buy one gun and reconfigure it for different missions.