The new Oculus CV-1 is expensive. Be great to DIY something as good or better for less. The Oculus DV-2 has a Samsung Note 3 screen over clocked to 75hz. So basically it is a headset with a phone screen in it. The CV-1 has a screen at 90 hz.
So, phone screen, headset, overclocked screen 75+ hz, and a bit of head tracking and Bob's your uncle. This thread is an important one for DIY VR.