The best replacement for i5 4670k is i7 4770k.

The best alternatives to i5 4670k are rated as following:
★★★★★  i7 4770k
★★★★  i5 3570k
★★★★  fx 8350
★★★★  i7 3770k
★★★  i5 4670
★★  i5 2500k
★★  fx 8320
★★  fx 6300
★  i5 4570
★  i7 2600k
★  a10 7850k
★  fx 9370
★  i3 4340
★  i7 920
★  amd fx 8350
★  fx 9590
★  4770k
  i7 3770
  3570k
  i7 4770

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Speaking about i5 4670k, one probably shouldn't forget about gtx 770.

Other search terms related to i5 4670k and their ratings are:
★★★★★ gtx 770
★★★★★ gtx 760
★★ r9 280x
hyper 212 evo
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i5 4670k
i7 4770k
i5 3570k