I'm sorry but you're a bit off in a few of your statements.
1. PAL Widescreen DVD resolution is 720x576, always.
2. A DVD does not have a resolution 720x304, never.
I've established this many times in these forums but somehow it doesn't get noticed.
720x576, which is the native resolution for a PAL DVD (720x480 for NTSC) is either 4:3 or 16:9 but always 720x576. Now, you say "But wait a minute! 720x576 isn't a widescreen resolution!! What gives??" Well, if it's a widescreen DVD, most likely it's anamorphic (rarely letterboxed). This means that to display the anamorphic DVD on a widescreen TV, the picture has to be stretched horizontally to display it in the correct aspect ratio. Thus, the picture effectively (not actually) becomes 1024x576.
Now, to get the most pixels out of the DVD when ripping which is the 576 vertical pixels, one would have to rip the DVD in the following resolutions:
720x576 for 4:3 (some call it fullscreen) material
1024x576 for 16:9 material
1024x432 for the 2.35:1 material
To read more about this stuff go here:
http://en.wikipedia.org/wiki/Anamorphic
http://en.wikipedia.org/wiki/Aspect_ratio_(image)
http://en.wikipedia.org/wiki/DVD-Video
http://en.wikipedia.org/wiki/Widescreen
Joshua.