Sacred Haven of Debauchery

I want the plot to be interesting and meaningful, not just mindless monster-slashing. More additional quests and more diverse items would be great. I like RPGs like that.

Then you should definitely play The Witcher. It only took me one day of playing to get hooked on the plot and gameplay. The next day, I was already reading the book ;) The game is also remarkable because it constantly presents the player with difficult choices (problems of neutrality, justice, principles, etc.). I must say that this is largely due to the writer, as some situations are literally copied, and there is usually always a "by the book" option. Perhaps this is one of the reasons for the game's genius; the developers strictly adhered to the novel, and, as they say, consulted with Sapkowski himself. In general, you should definitely play it; the plot shouldn't leave anyone indifferent ;)