Rem870 with a rifled barrel is the standard No Frills Lets Kill Me Deer setup.
Its what I've got and has yet to give me any complaints (well except the fore-end clicks and clacks if you get careless during stalks)
If I had to do it all over again I'd go with an auto...nor real accuracy loss and alot of recoil forgiveness.

You can shoot regular shells through the rifled barrel but you'd be wasting your time. When you spin the shotload like a bullet you get a big O pattern. Nothing in the center and a ring of shot all around your target....get two barrels if you want a dual purpose gun.