I've been depending on 870s for 40 years, so you can guess what my own preference is. For you, however, I'd suggest handling them all, shooting examples of each if you can manage it, and picking what you like best based on your own experience with the different shotguns in question.
What kind of shotgun is your bird gun, by the way? If you're already familiar with one of the listed designs, I'd suggest sticking with the same make/model if you can. I'm a believer in keeping it simple, and waking up with heart pounding at ohdarkthirty is a bad time to have to sort out the chops on a different shotgun IMO.
lpl