The best replacement for eight is nine planets.

The best alternatives to eight are rated as following:
★★★★★  nine planets
★★★★  8
★★★★  nine
★★★  eighth
★★★  nightster
★★  velvet
★★  iron 883
★★  windows seven
★★  six pack
★  ate
★  eighty
★  twenty-eight
★  dj quick
  protec
  rc8
  eight
  two thousand eight

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

Other search terms related to eight and their ratings are:
★★★★★ kate
★★★ eight
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eight
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