Have a pop along to this site.
http://www.7thzone.com/
I have a geforce card and also a Hollywood based dvd card.
And I would say that yes the dvd card is better than the geforce at picture quality and also speed. But only if your quite picky about these things.
To use the dvd card to display movies on your monitor it uses a pass thru cable from the geforce, which lowers the quality of the image to your monitor.Whether your playing movies or not!
The dvd card cannot handle the high refresh rates that the geforce is capable of producing.
What I do is only use the dvd card to send a signal to my widescreen tv, using an s-video cable. And ignore the pass thru cable altogether.
If I want to watch a dvd on my monitor I use WinDVD which performs very well with a geforce.
The cpu you are using is plenty fast enough to get good results from using Windvd.
So for occasional use I wouldnt bother. If you do get a dvd card then I can reccomend the Hollywood card for good performance and price.
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