Wavebird has my vote. I bought two of them about 10 years ago, and both are still working as good as new.
I wouldn't spend the $160 - $200 on amazon for one, though.
Looking around, this may be a decent alternative. Amazon.com: KMD Komodo Shockwave Wireless Black Controller for Wii and Gamecube: Video Games I've never tried it, but for $16, it's a minimal investment.
And thank you for editing your post instead of replying to yourself.