The best replacement for filtertron is p90.

The best alternatives to filtertron are rated as following:
★★★★★  p90
★★★★★  paf
★★★★  dynasonic
★★★★  humbucker
★★★★  hilotron
★★★★  tv jones
★★★  mini humbucker
★★★  fideli'tron
★★  powertron
★★  supertron
★★  gretschbuckers
★  dearmond
★  thundertron
★  tv classic
  wide range
  tv-jones classic

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

Other search terms related to filtertron and their ratings are:
★★★★★ dynasonic
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Google Trends

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filtertron
p90
paf