Good and low cost video cards for gaming?

I'm sort of new at buying graphics cards, and so I don't know what I should look for. All I know is that I'm looking for a card that can support Shader 3.0 at least. I'm running an XP with Service Pack 3, and my old video card (Raedon X300 series) is very quickly becoming out obsolete. I'm not too picking about the card, only that it can run games like Resident Evil 5(NVIDIA GeForce 6800 series or ATI Radeon HD 2400 Pro or better required) or Assassin's Creed II (256 MB DirectX® 9.0–compliant card with Shader Model 3.0 or higher required). Can anyone please help me? I'm hoping to get a video card for Christmas. :)|||Well it depends if your motherboard and psu will support the card but a good simple card that's not too dear to run those games would be a



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