I recommend you all to import a White Gamecube Controller from Japan.
http://www.play-asia.com/paOS-13-71-23-49-en-15-gamecube+controller-70-2ola.html
It's new, launched this year. The material used it's awesome and it's also white, so it matches perfectly with your Wii and the rest of controllers. I find it better than my wavebird.