And a team that hasn't changed names (Titans/Jets.) That leaves the Broncos, Raiders, and Patriots. But the Raiders did move to LA, and then move back to O, so I'd drop them, and the Pats changed from Boston to NE, which bothers me less but might bother true purists.
Which is a roundabout way of saying that I would've been OK with a Buffalo/Denver game as between the only two originals that never changed ANYTHING but logos and colors.