The best replacement for invader is x2n.

The best alternatives to invader are rated as following:
★★★★★  x2n
★★★★★  dimebucker
★★★★  carlos colon
★★★  bruiser brody
★★★  jb
★★★  dirty fingers
★★  emg
★★  black winter
★★  distortion
★★  powerball
★★  xymox
★★  super distortion
★  detonator
★  warpig
★  ox baker
★  d-activator
★  raider
★  snowmerdinger
  savio
  diezel einstein
  emg 81
  barnett ghost 350
  special edition
  savio vega

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

Other search terms related to invader and their ratings are:
★★★★★ alienguise
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Google Trends

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invader
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