The best replacement for corsair is kingston.

The best alternatives to corsair are rated as following:
★★★★★  kingston
★★★★  crucial
★★  g skill
★★  ocz
★  zero
★  razer
★  seasonic
★  crucial memory
★  thermaltake psu
★  kingston memory
★  mechanic
★  pacer
★  hellcat
★  ripjaw ram
★  pny
★  cooler master
★  samsung ssd
★  noctua fans
★  g.skill
★  evga psu
★  patriot
  antec
  coolermaster
  evga power supply
  p51
  patriot memory
  ocz ssd
  cooler master psu
  bucc
  ranger
  xfx psu
  p-51 mustang
  p51 mustang
  kingston ram
  intel ssd
  mushkin
  ducky
  buccaneer maplestory
  shadower
  seasonic psu
  crucial ssd
  spitfire
  g skill ram
  bowmaster
  pqi
  fractal
  gskill
  t-28
  transcend
  pny memory

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Speaking about corsair, one probably shouldn't forget about kingston.

Other search terms related to corsair and their ratings are:
★★★★★ kingston
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kingston
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