The best replacement for oculus rift is morpheus.

The best alternatives to oculus rift are rated as following:
★★★★★  morpheus
★★★★★  project morpheus
★★★★  sony
★★★★  glyph
★★★  sony morpheus
★★★  avegant
★★★  sony vr
★★  sony 3d headset
★★  google glass
★★  crystal cove
★  virtual boy
★  sony hmz
★  castar
★  ps4 vr
  avegant glyph
  sony hmz-t3w
  sony project morpheus

Your alternative for oculus rift is not listed? Suggest!
Speaking about oculus rift, one probably shouldn't forget about omni.

Other search terms related to oculus rift and their ratings are:

★★★★★ omni
★★★★ kinect
★★★★ skyrim
★★★ omni treadmill
★★ unity
★★ leap motion
★★ half life 2
razer hydra
You have in mind a companion for oculus rift and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of oculus rift in all years. Click on graph for more.
oculus rift
project morpheus