The best replacement for ti-89 is ti-84.

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

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