I never did like the idea of using a player capable of playing all the formats. I much prefer the codec idea, as it means everything can play it. Much like where on the Mac, a unified browser plig-in specification ages ago led to any browser able to do the same things, be it IE, Netscape, Safari, Cameo, Firefox, etc...

Plenty of codec packs out there that work well now. Usually I install one, along with Quicktime 7 (since I do use iTunes), and play everything through Media Player Classic.