The best replacement for 6870 is 6950.

The best alternatives to 6870 are rated as following:
★★★★★  6950
★★★★★  7850
★★★★★  7770
★★★★  7870
★★★★  5870
★★  6850
★★  560 ti
★★  660
★★  7950
★★  r9 270x
★★  560
★★  7790
★★  7750
★  gtx 460
★  650 ti
★  550 ti
★  r7 260x
★  5850
★  750 ti
★  6970
★  460
★  6770
  fermi
  5770
  gtx 560
  4870
  470
  gtx460
  hd 7770
  640
  570
  580
  560ti
  hd 6950

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Speaking about 6870, one probably shouldn't forget about 6850 crossfire.

Other search terms related to 6870 and their ratings are:
★★★★★ 6850 crossfire
★★★★★ q6600
★★★ 3 monitors
★★★ e8400
★★ 6950
★ 7870
★ 6970
★ apu
★ 7770
★ 5770
★ 6950 crossfire
★ 6770
5850
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Google Trends

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