No XBox 360? You can still use the XBox HD DVD drive with your PC if you're willing to get your hands a little dirty. You may still need to fight DRM battles to playback content once you get it hooked up, but teamxbox reports that a hack is available that allows PC connection to the Toshiba HD DVD drive.
http://news.teamxbox.com/xbox/12232/Legal-Hack-Makes-Xbox-360-HD-DVD-Drive-Work-on-PCs/
http://news.teamxbox.com/xbox/12232/Legal-Hack-Makes-Xbox-360-HD-DVD-Drive-Work-on-PCs/