The best replacement for he-400 is he-500.

The best alternatives to he-400 are rated as following:
★★★★★  he-500
★★★★★  hd650
★★★★  hd600
★★★★  mad dog
★★★★  dt880
★★★  he-4
★★  q701
★  he-300

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No companions for he-400 have been suggested so far.
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he-400
he-500
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