The best replacement for 670 is 770.

The best alternatives to 670 are rated as following:
★★★★★  770
★★★★★  760
★★★★  680
★★★★  7950
★★★★  7970
★★★  7870
★★  660
★★  580
★★  780
★★  760 gtx
★★  270x
★★  7850
★★  280x
★  660 ti
★  660ti
★  680 gtx
★  gtx 680
★  570
★  680 nvidia
★  gtx 770
★  r9 270x
★  676
★  780 ti
★  gtx 760
★  770 benchmark
★  680 sli
  690
  dr 770
  670 ho
  750 ti
  hd 7950
  470
  i7 860
  660 sli
  gtx 580
  i5 750
  670 ftw
  nuvi 680
  7970 ghz
  560 ti sli
  harmony 700
  7950 benchmark
  750
  290

Your alternative for 670 is not listed? Suggest!
Speaking about 670, one probably shouldn't forget about i5 3570k.

Other search terms related to 670 and their ratings are:
★★★★★ i5 3570k
★★★★ q6600
★★★★ 680
★★★ 680 sli
★★★ 2500k
★★★ i5 2500k
★★★ i7 920
★ 760
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Google Trends

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