The best replacement for power filter is canister filter.

The best alternatives to power filter are rated as following:
★★★★★  canister filter
★★★★★  canister
★★★★  power conditioner
★★★★  internal filter
★★★  undergravel
★★★  bio wheel
★★  protein skimmer
★  undergravel filter
  sponge filter

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Speaking about power filter, one probably shouldn't forget about protein skimmer.

Other search terms related to power filter and their ratings are:
★★★★★ protein skimmer
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power filter
canister filter
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