We have almost everything but Gamecube, ironically that is my favorite. But the Gamecube games can be played on another system we have, I forget which one. We have a Wii, PS2, Xbox, Super Nintendo, Dreamcast, Nintendo DS, the newest Game Boy, we even have the original Atari system, in the original box and everything and it works!
My favorites are Gamecube, Dreamcast and Playstation.