The best replacement for 3900 is 4300.

The best alternatives to 3900 are rated as following:
★★★★★  4300
★★★  3900e
★★★  specialized hardrock
★★  280
★★  2900
★★  3700
★  3800
★  pioneer 2000
★  trek 4300
  gt avalanche
  3926t
  giant revel 1
  giant rincon
  cannondale trail 6
  polaris 480
  revel 1

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