Being that you are sending to an HD monitor, you should be working in a 720×480 comp with 1.21 rectangle pixels. When you render your animation the DVD software should recognize the wide screen format and burn you a dvd that will be read correctly by the DVD player.
As far as it being sent to a 720 monitor, if you are burning a DVD and not a blu-ray, it doesn’t really matter, it will be upscaled by the monitor.
I find the AE MPEG-2 DVD preset works very well. If you are using encore you should be able to drop that into a timeline, set your end action and be good to go.
Johnny Cuevas, Editor