The best replacement for s1 is s3.

The best alternatives to s1 are rated as following:
★★★★★  s3
★★★★  s2
★★★  xl1
★★  mako
★  s3 suspend mode
★  s3 suspend
★  s3 sleep
★  g10
★  s3 standby
★  s2 easton
★  j1
★  m1 easier
★  m2
★  vs2
★  cf5
★  s2 elise
★  demarini cf5
★  d1
★  j3
★  bdp s300
  e106
  s3 power
  s3 windows 7
  canon s2
  bushnell geo
  v12
  demarini voodoo
  vs1
  a1
  g1
  sony t33
  s0
  s1w
  bd p1000
  s14
  s3 power management
  v10
  s3 motocaddy
  j2
  s1g1
  ns6

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Google Trends

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s1
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