GTX560ti 2Gb (notice the "ti")
GTX570 2,5Gb
These are the two NVIDIA cards to have for the time being (sorry, I am not an ATI guy so not experience there).
Do not go for less than 2Gb VRAM.
The game plays nicely with these cards after the latest patch.
Probably the GTX560ti 2Gb is the one that fits the budget.
~S~
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