.50 Beowulf.
Really.
If it were me, I'd use a lever .44 Mag, but between the ones you mentioned, I'd take the fullsize AK with the folding stock. I don' know why anyone would ever choose a pistolized rifle if you had space for a real rifle.
A cheap 12 gauge shotgun.
-A 12 gauge can take down any man or beast in North America.
-They are effective out to 100 yards (further than most people will need a self-defense/utility firearm)
-They are cheap and reliable (you can find used 870's or 500's for $200 or less).
-For up-close civilian self-defense situations their effectiveness can't be matched.
20 gauge single shot.