The best replacement for i5 is i7.

The best alternatives to i5 are rated as following:
★★★★★  i7
★★★★★  i3
★★  core 2 duo
★★  i7 imac
★★  i7 macbook pro
★★  amd
★★  i7 gaming
★★  i7 macbook air
★  i7 for gaming
★  i7 haswell
★  i7 processor
★  quad core
★  i7 laptop
★  a10
★  core i7
★  a8
  core 2 quad
  g5
  i7 benchmark
  i7 mac mini
  duo core
  i3 for gaming
  i3 processor
  c320
  i7 benchmarks
  amd a10
  i7 processors
  i7 mac
  i7 performance
  intel i7
  core duo
  c330
  amd quad core
  fx 8350
  17
  amd phenom
  i7 video editing
  i3 performance
  sm57
  nehalem
  dual core
  x6
  intel core i7
  g5 irons
  i10
  phenom ii
  amd a8
  xeon
  phenom
  i4
  shure sm57
  i4s
  amd phenom ii
  g5 ping

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

Other search terms related to i5 and their ratings are:
★★★★★ hyperthreading
★★★ 8gb ram
★★★ gtx 770
★★ gtx 780
★★ gtx 660
★ i7
reliance
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Google Trends

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i5
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