From what I've heard, running VR is more demanding than running a single display at the resolution the VR headsets run at, I'd also like to play all of the games I have in VR and not just VR exclusive games.
I meet the requirements for the Oculus Rift but I would prioritize upgrading my GPU first to get the full usage out of a VR setup at a good level of performance with good visual quality, in terms of graphical settings and resolution.
I'm planning on waiting for the new GPUs for a GPU upgrade though, hopefully they'll be really good and a big improvement from the current generation of graphics processors.
Games I want to play in VR, Dark Souls III, Grand Theft Auto V, Planet Side 2, Borderlands 2, Borderlands: The Pre Sequel, Guild Wars 2 etc.
Most of the less demanding games like Planet Side 2 and the Borderlands will probably run fine, but I want to play the more demanding titles as well at over 60 fps.
I can see GTA V being a real pain to run at 90 fps average, that game is really CPU intensive, some faster memory and a CPU overclock to 4.8GHz should help keep my minimum frame rate above 70 fps, however currently with my 4790K at stock and my GTX 970 I do get some dips to 50 because of my 1333MHz ram that I've had for years.