The best replacement for 8 ohm is 6 ohm.

The best alternatives to 8 ohm are rated as following:
★★★★★  6 ohm
★★★★  4 ohm
★★★★  16 ohm
★★★  6 ohm speakers
★★  2 ohm
★★  4 ohm speaker
★★  4 ohm subwoofer
★★  4 ohm speakers
★  16 ohm speakers
★  16 ohm speaker
★  70 volt speakers
★  600 ohm
★  70 volt
  70v
  4ohm
  32 ohm
  2.4 ohm
  100v
  3 ohm

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Speaking about 8 ohm, one probably shouldn't forget about 16 ohm.

Other search terms related to 8 ohm and their ratings are:
★★★★★ 16 ohm
★★★★ 4 ohm speakers
★★★ 4 ohm
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8 ohm
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