I am a fan of the Muzio Gambit with White and the Cunningham as Black's defense. The Falkbeer Counter Gambit is complicated, and interesting for both sides. Fischer invented a variation of the King's Gambit Accepted he probably believed was a refutation of White's King's Gambit. Spassky was one of the few grandmasters who played the King's Gambit. The Falkbeer Counter Gambit is not unlike the Albin Counter Gambit on the Queenside. So I am assuming the Falkbeer would be the choice of some of the players here.
My New King's Gambit Group!
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Come join my King's Gmbit Group to learn about and play the King's Gambit. The link to join is below!
http://www.chess.com/groups/home/kings-gambit-players2