The best replacement for 680 sli is 780 ti.

The best alternatives to 680 sli are rated as following:
★★★★★  780 ti
★★★★★  690
★★★  7970 crossfire
★★  gtx 690
★  titan black
★  gtx titan
★  7970 ghz crossfire
  670 sli
  7970 xfire
  gtx 780 ti
  780 sli

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Speaking about 680 sli, one probably shouldn't forget about 670.

Other search terms related to 680 sli and their ratings are:
★★★★★ 670
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680 sli
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