Among all game I played, I think these 5 musics are the best in emotional expression:

1) Fate / Stay Night - Emiya
2) Dungeon Seige II - Freedom For A Price
3) Neverwinter Nights II: Mask Of The Betrayer - Betrayer Theme
4) World Of Warcraft: Wrath Of The Lich King - Arthas, My Son
5) Neverwinter Nights: Neverwinter Nights Main Theme ( Intro )