The best replacement for 660 ti is 760.

The best alternatives to 660 ti are rated as following:
★★★★★  760
★★★★  670
★★★★  660
★★★★  7870
★★★★  7950
★★★  770
★★★  r9 270x
★★  7850
★★  650 ti
★★  560 ti
★  750 ti
★  680
★  580
★  7970
★  gtx 670
★  270x
★  gtx 760
★  650 ti boost
★  570
★  r9 280x
★  7870 ghz
  gtx 660
  6950
  gtx 580

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Speaking about 660 ti, one probably shouldn't forget about i5 3570k.

Other search terms related to 660 ti and their ratings are:
★★★★★ i5 3570k
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