If you like Sci-fi RPG's then the Mass Effect games are a good buy. Also as Joram mentioned the witcher 2 is a good game. It helps to have played the first game though but it's not really needed as you can just read up the story of the game online.
You mentioned Drakan - I'm assuming you have played the PS2 game 'The Ancient's Gates' if so the PC prequel is worth playing & vice versa if you haven't played TAG but played the first game.
