On the classical side "Oh Fortuna" by Carl Orff [the Conan The Barbarian theme], "Ride of the Valkyries" from Die Walkure by Wagner [I love the smell of Sith blood in the morning
] or a personal fav "Anvil Chorus" from Il Trovatore by Verdi...esp if your choreograph or vid edit to synchronize the blade clashes to the hammer on anvil clashes of the chorus.
On the pop side "Another One Bites The Dust" by Queen, or maybe "Princes of The Universe" - it worked for Highlander eh?
Also its not exactly 'fight music' but with the right vid editing methinks "The Dragon's Heartbeat" by Randy Edelman could work very well.