Chuck - good thread. Taiyo Yuden are generally very good discs, the best media in the world is Mitsui, but they are also more expensive too.
Keep in mind as well that your computer displays more screen area of a DVD than a standard TV does - so when/if you create menus, make sure to leave a safe zone of about 8% (yes I just pulled that number out of my butt!) so that your text and graphics show on every screen.
H.264/Mov files are not the way that you would ultimately like to go, when you create a DVD, you are outputting MPEG-2 - so better to keep it in that format if possible. Do NOT push your bitrate over 8MB/s, or it will not play on all machines - better to have it around 6 or 7 so that you don't get choppy playback on some machines.
High Def. HD-DVD is not really a great idea - it is dying off, Blu-Ray is the way to go if that is really what you want to do. Best not to invest time and money into a dying format. In short HD-DVD has less capacity than Blu-Ray, the main issue though is with the data transfer rate. HD-DVD can only put out about 30MB/s of video (36MB/s total on disc) and Blu-Ray can put out 40MB/s (56MB/s total on disc) - also Blu-Ray isn't restricted on audio, and can go completely lossless - whereas HD-DVD is not as good a format for audio.
Just a bit more info.