First non-DnD RPG you played? Champions fourth edition. I actually played it before I played ADnD 2E.
Super heroes have always been a great love of mine. It led me to Comic Book World, where I met my wife and now work. And I got my degree in Graphic Design because I wanted to draw comics. I spent hours making up and drawing characters and working up story lines.
Champions just seemed like a natural fit for all of that. And it was. I still have a great fondness for it, but if I had my druthers, I'd prefer to play the Big Blue Book over the newer editions.