The best replacement for 580 sli is 680.

The best alternatives to 580 sli are rated as following:
★★★★★  680
★★★  590
★★  690
★★  6970 crossfire
★★  gtx 590
★★  6990
★  gtx 690
★  7970 crossfire
  gtx 780
  680 gtx
  6970 cf
  670 sli

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Speaking about 580 sli, one probably shouldn't forget about 590.

Other search terms related to 580 sli and their ratings are:
★★★★★ 590
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580 sli
680
590