The best replacement for korg is yamaha.

The best alternatives to korg are rated as following:
★★★★★  yamaha
★★★★  roland
★★  kurzweil
★★  yamaha keyboard
★★  akai
★  casio
★  thing
★  moog
★  roland keyboard
★  yamaha digital piano
  nord
  alesis
  alesis micron
  snark
  roland keyboards
  tascam
  tyros
  yamaha piano
  digitech

Your alternative for korg is not listed? Suggest!
Speaking about korg, one probably shouldn't forget about kaoss pad.

Other search terms related to korg and their ratings are:
★★★★★ kaoss pad
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korg
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