Don't forget that a Wii has basically a Gamecube built into it as well. I've been playing Metroid Prime 2 and the Zelda OOT Master Quest on it this past month (in 480p with the component cable ) while I wait for new Wii games to come out.
I'm not a big golf fan, but Tiger Woods might actually be fun to play on it. I'll probably rent it first and see how it is.