I recently watched Yojimbo. It is the movie that A Fistful of Dollars was inspired by. It is Japanese and is about a bodyguard (yojimbo in Japanese) that comes into a town and sets out to destroy the two rival gangs that are terrorizing the regular townsfolk. It is directed by Akira Kurosawa who also directed The Hidden Fortress and Seven Samurai. I would recommend all three of these movies.
I really liked this movie even though I kind of knew the plot line because I had recently watched A Fistful of Dollars. One thing that stood out to me was the music. It was well done and really helped to set the tone and mood of the story. The main character inspired confidence. I had a hard time keeping track of which villain was which sometimes but I got the main gist of it. One interesting twist was the fact that most of the fighting was done with swords. There was only one gun in the movie which gives the gun wielder quite an advantage. Bringing a knife to a gun fight indeed.
If you like the man with no name trilogy I would give this movie a try.