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• Hyper-Battle Ikki Tousen
• Tenjho Tenge

HSDK - manga is finished but it has an anime
something like katekyo hitman reborn could work too since has a lot o fights

Fist of the North Star?

Kenichi: The Mightiest Disciple aka History mightiest disciple Kenichi

Ninja Scroll. Is a movie, is relatively old, but still holds up well today. (Seems there was also a 13-episode series in 2003, but haven't seen that). Both are done by Madhouse. Focuses more on weapon-based side of martial arts, certainly has supernatural elements included.

Street Fighter II the animated movie is also an obvious choice.

Edit for troll answer: Bobobo-bo Bo-bobo . It has some fight scenes in it.

Ranma 0.5 (one half)
Might seem like a strange suggestion but there are occasionally decent fights and the rest of the time things are so silly and funny that you just keep watching anyways.

Soooo many good fighting shows are incomplete (Tengou Tenghe being the worst offender by far) so I simply can't recommend them.

Boku no piko? I heard that anime is full of action, dont know if they have martial arts D:

For a serious recomendation, Hunter x Hunter and Samurai Seven D:

Samurai Champloo

Hunter x hunter
Shadow Skill

Er... The breaker new waves, perhaps? ED: Forget about it, I thought you meant manga, not anime :p

Samurai Champloo sounds like a decent fit.

Perhaps you might enjoy Yu Yu Hakusho

RAINBOW is a great show that has a boxing side story