The best replacement for i5 3570k is i7 3770k.

The best alternatives to i5 3570k are rated as following:
★★★★★  i7 3770k
★★★★  i5 4670k
★★★★  fx 8350
★★★  i7 4770k
★★★  i5 4570
★★  fx 6300
★★  i5 2500k
★★  i5 3570
★★  i7 2600k
★  fx 8320
★  i7 3770
★  8350
★  amd 8350
★  2500k
★  amd fx 8350
★  i5 4570k
★  i7 2600
★  i5 4670
  core i7 3770k
  i5 3470
  i5 4430
  4670k
  i7 2700k
  amd 8150
  i7 920
  i7 3820

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Speaking about i5 3570k, one probably shouldn't forget about gtx 780.

Other search terms related to i5 3570k and their ratings are:
★★★★★ gtx 780
★★★★ gtx 770
★★★ gtx 760
★★★ gtx 660
★★ gtx 670
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i5 3570k
i7 3770k
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