The best replacement for 6670 is 7750.

The best alternatives to 6670 are rated as following:
★★★★★  7750
★★★★★  7770
★★★★  6770
★★★  5770
★★★  6570
★★  r7 250
★★  4850
★★  r7 240
★★  7790
★  gt 640
★  7610
★  9800gt
★  650
★  6450
★  640
★  4870
★  6750
★  630
★  550 ti
★  nokia 7610
★  hd 5770
★  610
  6630
  nokia 3230
  hd 7750
  6680
  hd 5670
  5670
  5570
  gt 630

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Speaking about 6670, one probably shouldn't forget about a8.

Other search terms related to 6670 and their ratings are:
★★★★★ a8
★★★★★ 3870k
★★★★ a6
★★★ 6770
★ a10
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Google Trends

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6670
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