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NFL wise, I would place it just under the Jets SB victory over the Colts in '69.
Bingo. By a hair's breadth.
The New England upset of St. Louis, while shocking, doesn't have the historical significance. New England wins this game they are not only 19-0 they are almost certainly at the top of every "Best Ever Dynasty" discussion for the next 30 years. New York didn't just stop the perfect season in the most dramatic fashion possible, they probably killed the Patriot's hopes for a "Best Ever Dynasty" claim as well.
The only reason the Jets SB win gets top nod are the NFL-landscape altering implications of the NFL/NFC vs AFL/AFC matchup.