Second for Torment. Great game, especially if one has become a bit bored of the more mainstream fantasy stuff. Snippets from Wikipedia:

"Planescape: Torment differs from similar CRPGs like those in the Baldur's Gate series by placing an emphasis on conversation and storyline, as opposed to an emphasis on combat. ... The game's main themes include guilt, redemption, the significance of names and the importance of knowing oneself."

"Planescape: Torment is notable for the quantity of dialogue (in text form) which it contains. An estimate by the creators of the game places it at almost 1 million words. This is comparable to one volume of the Encyclopædia Britannica. It has been argued that the wordy nature of the game may have turned off potential players, having realized that gameplay often focuses on resolution of quest and story objectives through selection from available dialogue choices, rather than through combat encounters."

There's still quite a bit of combat, though. Less than in BG, and some of it is avoidable, but expect to fight a plenty of odd critters in the course of the game.