And by awesome, I mean cooler than "He pointed his wand and used a spell that instakilled the enemy forever or disarmed the enemy and won,".

 

I like to think I write a pretty swell fight scene. I've got an old HP/DF fic in the WbA.

 

I highly recommend the Denarian Trilogy by Shezza The Denarian Renegade, The Denarian Knight, and The Denarian Lord

 

The graveyard scene in the first story is the first fight scene that comes to mind. Other than that, Only Enemies has some good ones as well.

 

The Awakening Power by Sib-FF has some good duels. So does the The Lie I've Lived, and most things by JBern.

 

To Fight the Coming Darkness by jbern

 

Definitely Shezza. Also Wastelands of Time and Heartlands of Time.

 

My favorite fight scene is probably the Battle of Hogwarts scene in The Prisoner's Cipher. It has it all.

 

The fight I liked the most is Harry and Voldemort's duel in The-One-He-Feared.

 

The two best I like are https://www.fanfiction.net/s/8175132/1/Jamie-Evans-and-Fate-s-Fool in which Harry is accidentally dimensionally shifted and gender-bent, Voldemort is destroyed as easy as stealing candy from a baby and the awesome fight is against Grindelwald who is possessed by the horcrux of Dumbledore, plus magic tanks!
Also great is https://www.fanfiction.net/s/6763981/1/The-Dark-Lord-s-Equal in which the best Voldemort vs Harry fight exists.