Conina, the Oculus Rift is expected to arrive by Q1 2016.
https://www.oculus.com/en-us/blog/first-look-at-the-rift-shipping-q1-2016/
Althought I wouldn't be too surprised if they push it back again.
What surprises me the most from your numbers is that you are adding AMD cards into the question. With Nvidia being Nvidia, I wouldn't be surprised if they were talking about Nvidia based PC. Because of course VR will not be "perfect" running on a platform that can't use their GameWorks VR crap.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.