It all depends what you want to do with it. It sounds like you mainly want to do 2D work - the radeon 9600 you mention would certainly do this but it would be overkill. Any graphics card on the market these days will handle 2D no problem.
If you fancy playing arcade games or using your computer as a media center (i.e. watching/recording tv then a high powered card like the one you mention would be a must.