I would say having crossfire would cause POTENTIALLY more problems than having 1 card *more power, more noise, more heat* although I would guess at your resolution you wouldn't get the full benefit anyway.
I would say it is a safer bet to go with a 6950, I don't really think the extra FPS the 70 card or crossfire would bring to the table would amount to much of a increase in performance. If you get the microstutter problem with Xfire 5870 believe me, you will not want to use Xfire again.
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