<< Windows XP is better than Windows 2000, especially for games and multimedia. >>
Not sure I totally agree with that. XP is a great OS, but so is Win2k. In almost everyway and fashion they are similar, just XP has a bit more features, some positive, some negitive. Id make sure all your new stuff will be compatible with either OS before taking the leap, but definitely do upgrade. Make sure what you are planning on getting will run in XP, if not you may run into a few snags (you may anyway).
Win2k has been out for a while thus driver support has definitely caught up to it. For me personally I will not upgrade to XP anytime soon, not until more support is available, or the first service pack is released.