Tru - life got in the way. I was a red box D&D player, and ended up with the Basic/Expert/Challenger/Masters/Immortals rules, plus all the GAZ series.
But then I also played CoC, Shadowrun, Star Wars RPG, Paranoia, Judge Dredd, Traveller, Twilight 2000, MERP, Runequest, Judge Dredd RPG and Ghostbusters RPG campaigns, as well as wargaming and board gaming. I miss those days...