So what was the whole point of this post? It seems to me you got both of them.
The only thing you did wrong is to order the HD-DVD addon for the 360, you should have gotten the 98$ HD-DVD, Stand-alone HD-DVD player > xbox 360 player.
Reason, its much quieter, you don't want hear your 360 when you are watching a movie, a buddy of mine has a 360+ the addon and the 360's make stupid amount of noise, and that disrupts my viewing experience.
If you still have time I would return the addon for the 360 and would get the stand alone player.
Thats my 2 cents.
I have not purchased the HD-DVD yet. However, the $98 HD-DVD player is only capable of 1080i output and the 360 is capable of 1080p with the HDMI adapter.
Oh, and noise... What noise? I only hear noise when I'm playing games and it is loading a level. Otherwise, all I hear is my surround sound.