I'd only consider the 6950 CF option, going from a 580 to a 6970 would be pointless unless single card eyefinity or DTS HD passthrough are features you want.
Realistically you'd get significantly better performance at 1920x1080 and above with the crossfire setup in the majority of recent titles but do have to live with the occaisional growing pains on new releases ( I 've owned 4 multi card / dual gpu setups both SLI and CF ) If you have room in your enclosure for 2 dual slot gpus and dont intend to watercool, 2 6950s would be decent for the 20% increase in price over a 580 ( I fully expect them to go for 300-330 in canada, I got my 580 for well under 500cnd )
You do game at 2560x1600 if I recall so 2 6950 might be the way to go for you. They should allow playable performance in nearly all current titles with 8x AA if thats your cup of tea.




. I'd be unsurprised if the 6950 dropped at $280 on newegg.
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