The best replacement for colby is cheddar.

The best alternatives to colby are rated as following:
★★★★★  cheddar
★★★★  bates
★★★  bowdoin
★★  hamilton
★★  colgate
★★  cheddar cheese
★  colby
★  kenyon
★  middlebury
★  coby
  macalester
  czerniak
  longhorn
  monterey jack cheese

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Speaking about colby, one probably shouldn't forget about mizz nina.

Other search terms related to colby and their ratings are:
★★★★★ mizz nina
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Google Trends

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colby
cheddar
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