This. Wii even has the slots for the Gamecube memory card and port for the controller. If you do go this route I think the newer Wii's that only sit upright removed all of this and don't support the Gamecube games.
Killer 7, REmake RE, RE O and Metroid Prime are must haves.
damn this is bringing back memories.
Killer 7 - what a strange game, but the style was piff
REmake - This is the game that made me want the cube
RE 0 - cool
Metroid Prime -

That first game is neck and neck with RE4 for the the best game on the console.
I would also throw viewtiful joe on there if you never played it on the ps2