The best replacement for arima is arma.

The best alternatives to arima are rated as following:
★★★★★  arma
★★★★  garch
★★★★  exponential smoothing
★★★  c-dory
★★★  holt-winters
★  arima
★  trophy
★  ucm
★  grady white
★  arimax
★  striper
  c dory

Your alternative for arima is not listed? Suggest!
Speaking about arima, one probably shouldn't forget about eviews.

Other search terms related to arima and their ratings are:
★★★★★ eviews
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arima
arma
garch