I did elves so it is only fare that I do men. First a list of possible men that I can think of in a pinch but you can choose any.
Beren son of Barahir, who took a Silmaril and participated in the hunting of Morgoths great wolf.
Turin Turambor, the most ill-fated of heroes
Hurin Thalion who fought bravely at Nirneath Arnoediad until he was captured and brought before Morgoth but never asked for mercy for himself or his family.
Theoden who rode out of Helms Deep into unnumbered Orcs, who rode to the aid of Gondor and, in the book if I remember correctly, rode alone against the witch king before being crushed beneath Snowmane (his horse) who was impaled by a poisopned dart.
Earindil the mariner who sailed to Valinor, which only one other man did succesfully (or maybe not depending on what you believe), to ask for aid against Morgoth.
There is abviously Aragorn, Eomer, Faramir, Boromir, my favorite Bard the Bowman, Eorl the Young, Brand of Dale, Arathorn father of Aragorn, Elindil, Isildur and others.
I think that the bravest are Hurin Thalion for Nirneath Arnodiad, Turin Turambor for everything in his life and Theoden of Rohan form the book not the movie.
I think it has to be either Beren or Turin. Beren for his quest for the Silmaril and standing up to Thingol to ask for Luthiens hand. Turin, because he knew no fear. He went out and did what he needed to do.
Theoden was brave, but he was more endearing to me. He wanted to go out of this world in a blaze of glory, so he had nothing to lose.
As I said Turin was troubled and ill-fated throughout his whole life but he was perhaps the greatest hero of all, always fighting against Morgoth and he killed Glaurung.
Theoden was much more heroic in the book than the movie.