The best replacement for s4i is s4a.

The best alternatives to s4i are rated as following:
★★★★★  s4a
★★★★★  s4i ii
★★★★★  mie2i
★★★★  bose ie2
★★★★  s4
★★★★  s5i
★★★  se215
★★  x4i
★★  x10i
★★  ie2
★★  s3m
★★  x7i
★★  ibeats
★★  bose mie2i
★  beats tour
★  earpods
★  etymotic hf2
★  s4i rugged
★  urbeats
  image s4i
  monster turbine
  monster dna
  s4i reference
  klipsch s4
  etymotic
  hf3
  soul sl99
  600vi

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Google Trends

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s4i
s4a
s4i ii