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As someone who deals with these cards for a living (for professional use, not selling them at a computer store*), I can tell you the 256MB version is not worth the extra money. The games that will actually *need* that amount of memory will be so generally demanding that the VPU itself will become a bottleneck. The 128 9800 Pro made by ATI (or Sapphire, they're identical) is an excellent choice.
You'll also find that it has superior pixel and vertex shading than the nVidia cards, plus 100% Direct X 9 compliance. That means no hardware shortcuts to get higher benchmarks (although both companies have been guilty of driver cheats).
The fourth option looks like it's made by Creative Labs, which is a trustworthy brand with a long history, at least here in the States. I don't know what that max res of 1024x768 is all about--the average card these days can do twice that. It must be up to 1024x768 at a specific refresh rate, like 100Hz. Do you have a link for that one? I would personally choose that one of the bunch, unless it really did have some odd resolution issue.
*No offense to those who work at computer stores, that was just for clarification
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"The idea that money doesn't buy you happiness is a lie put about by the rich, to stop the poor from killing them." -- Michael Caine
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