Well i want to buy oculus when it come out, and my pc have this Intel core i7 4790k, Msi z97 gaming 7 atx motherboard, MSI Nvidia GTX 970, 2 corsair pro vengrance x 8, Corsair RM750 Gold certificated, 2 SSD Samsung evo 850 250 gb and 500 gb, Deepcool Captain 240, Case: Cooler master Stryker,

I read that the minium specs need a GTX 970, so I dont know, should i buy another 970 or upgrade for one 980 ti, or nothing my rig its great, and how many year do you thing that i dont need a upgrade? thx sorry for the bad english!