The best replacement for 7970 crossfire is 7990.

The best alternatives to 7970 crossfire are rated as following:
★★★★★  7990
★★★★★  290x
★★★★  r9 290x
★★★★  780 ti
★★★  770 sli
★★★  690
★★  680 sli
★★  670 sli
★★  780 sli
★  580 sli
★  gtx titan
★  gtx 690
  gtx 680 sli
  760 sli
  hd 7990
  gtx 670 sli

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Speaking about 7970 crossfire, one probably shouldn't forget about 7990.

Other search terms related to 7970 crossfire and their ratings are:
★★★★★ 7990
★★★★ 7950
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7970 crossfire
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