GPU: GTX 1070 or GTX 1080 as GPU for VR. Both are great cards. GTX 1080 is the better one but a bit pricy for that more power. GTX 1070 is still a lot better than the current minimum requirements for VR for Rift and Vive (GTX 970) especially for VR. If you would mirror your VR screen on some TV probably get a card with two HDMI outputs. In theory even DP should work… but if your TV does not support DP native then consider to by an adapter … or two 
CPU: Core I7 6700 (K), 7700(K). CPU does not matter that much. Even CoreI5 would do very well for playing your game afterwards but if you compile a lot and build that lightning then CoreI7 would be nice to reduce your wait time (a bit).
Ram: 16GB should be enough for a while. DDR3 or DDR4 does not matter.
Pretty much everything else is more or less on you. HD SSD or not. If you build your PC yourself you would even take a look to get a PSU of a good brand and you would avoid buying the cheapest possible mainboard if you find some stone-age capacitors on it.