You are more likely to get "a lifetime of use" out of a pair of monitors than a VR headset and a pair of monitors will be useful for many things aside from gaming if you use your PC for other stuff. If VR does become popular, there is no doubt that there will be better and cheaper headsets in not-so-distant future.
I'd also be wary of buying into something that doesn't have a vendor-agnostic API. To me, it feels like VR is still in its early-adopter/open-beta phase.