The best replacement for 80 400 is nikon 80 400.

The best alternatives to 80 400 are rated as following:
★★★★★  nikon 80 400
★★★★  sigma 50 500
★★★★  70 200
★★★★  50 500
★★★  canon 100 400
★★  sigma 120 400
★★  sigma 80 400
★★  sigma 150 500
★★  200 400
★  nikon 300
★  120 400
★  70 300
★  80 200
★  100 400
  300
  tokina 80 400

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Other search terms related to 80 400 and their ratings are:
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80 400
nikon 80 400
sigma 50 500