Definitely TIE Fighter Collector's CD-ROM. Oddly enough, the last PC Gamer magazine I looked at (this was like five years ago) had this game rated #1 of the top 100 games of all time. I'm sure that's changed by now, though . Other oldies I love are Syndicate, Civilization (I think I've logged more hours on this game than any other ever), Falcon 3.0, Doom, Dark Forces, Command and Conquer: Red Alert, Starcraft, and Sim City 2000.