Personally would go with the GTX 560Ti 448 core.
Little beefier than the regular 560Ti for only $10, and the 1280 vs 2GB vram shouldn't be a game changer.
That being said I am quite biased toward Nvidia.
However, the 6950 will go blow for blow with the 448 core, depending on the game
, for $50 less (after rebate).
AnandTech - Bench - GPU11
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Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X