I'm probably the wrong person to ask, but my preference is for sxs shotguns and I own them in 10, 12, 16, 20 and 28 gauge. Some of them are hammer guns, too. The newer ones come with choke tubes, can shoot steel and, if you prefer, a single trigger. There's something about them that just screams "Shotgun!" in a way neither semiautos, pumps or over/unders does. Take a look at the CZs and the F.A.I.R. lines.

But I'm an old guy and I like old things.