Id buy anything with more than 1.5gb or VRAM. I think 6950 2gb is the best bang for the buck at this moment. You can bios upgrade it to 6970 and with some manufactures it does not even void warranty. 560TI is not a bad card either, but you´d have to find one with more VRAM than 1gb and I don´t know the cost of that. Or go all out and buy fastest Nvidia single gpu card or Ati 6970 factory OC´d or one with good cooler for OC´ing.
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