The best replacement for little phatty is voyager.

The best alternatives to little phatty are rated as following:
★★★★★  voyager
★★★★  slim phatty
★★★★  mopho
★★★  sub phatty
★★★  sub 37
★★★  mopho keyboard
★★  minimoog
★★  minitaur
★★  minibrute
★  prophet 08
★  mopho x4
★  mono evolver
★  evolver
★  minotaur
  korg r3
  studio electronics

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Speaking about little phatty, one probably shouldn't forget about moogerfooger.

Other search terms related to little phatty and their ratings are:
★★★★★ moogerfooger
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Google Trends

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little phatty
voyager
slim phatty