The best replacement for ti 89 is ti 84.

The best alternatives to ti 89 are rated as following:
★★★★★  ti 84
★★★  ti nspire
★★★  ti 89 titanium
★★★  nspire
★★  ti 83
★★  ti 92
★★  hp 50g
★  nspire cas
★  hp50g
★  voyage 200
★  ti 86
★  84
★  ti nspire cx cas
★  ti nspire cas
  hp 49g
  hp prime
  92
  casio prizm
  ti 84 plus
  ti 84 silver edition
  cx cas
  hp 50
  83
  ti 83 plus
  49g

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ti 89
ti 84
ti nspire