From what I have played & own:
Saturn -> Super Nintendo -> Nintendo64 -> Genesis -> Playstation -> Gamecube -> Nintendo -> Dreamcast -> Gamegear -> Gameboy Color

Now, before someone thinks my selection is wierd or crap, remember I only own 14 systems and I'm only grading them on what I own and games I own for them and played. I'm sure if I owned complete collections and played most of the titles available I would have a different line-up.