The best replacement for sagan is waltz.

The best alternatives to sagan are rated as following:
★★★★★  waltz
★★★★  cavendish
★★★★  velikovsky
★★★★  hawking
★★★  snort
★★★  reiner
★★★  ossec
★★  cancellara
★★  sandburg
★★  jung
★★  perkins
★  mark cavendish
★  stephen hawking
★  ernst mayr
★  goss
★  matrix
  sandberg
  icahn

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Other search terms related to sagan and their ratings are:
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