I bought a Pimax 4k, if your not bothered about room scale or the hand controllers (I have HOTAS for ED and a decent steering wheel set up) for the games you're playing then it's higher resolution and better "screen door" effect makes it good value if you get it from Gearbest in one of their flash sales.
Mine was about £240 so even with the OR price drop it's still a good value way into VR, i will probably buy a Rift or Vive eventually but the Pimax is very good for the sit down games I'm interested in at the moment so I'll wait for the next gen before I worry about room scale i think.
(I did try both OR and Vive, neither seemed worth the extra cash UNLESS I wanted room scale, the Pimax definitely has them beaten on picture quality and set up but the OR was more comfortable to wear, not that the Pimax is bad, just not as good as OR, about the same as Vive.)
I actually play with the Pimax (although they appeared to send me the BE version, which is *not* 4k, it's actually less at 2k, but still a better resolution than the Rift and Vive and has a better refresh rate than the original Pimax 4k -- original 4k is 60hz, the BE is 95-120hz)
There is a 'dift' issue with the headset, because it needs to rely on gyro's for tracking, which are not the most reliable, but if you're using a HOTAS or controller, then you can just bind the re-center key to one of the buttons, so it's not that big a deal
If you're looking to just play Elite (and you're fairly tech-savvy) then I would add the Pimax for consideration. If you're after a more holistic experience, and want to play other stuff in VR, then I would not go with the Pimax.