Right now Lenovo Explore Mixed Reality Headset is $199 on Microsoft.Com. If you are considering getting in to VR. This is a great Starting point. it is Ranked the #2 Windows Mixed Reality Headset Right behind the Samsung WMR. But at this cost it is worth a try.
I own an Oculus Rift and a Lenovo Explorer Mixed Reality Headset. If cost is the Same go with the Rift (But add 3rd Sensor). I was able to get Lenovo WMR for $199 from Microsoft. that was just too good of a deal to pass up. If you want to be able to play Vive Games WMR Controllers work better...
Based on everything I read the GTX 1070 is going to push up against the Titan X. Which is saying a lot. So if you want to run every Game in 1080P at Ultra Setting this card will do it while it never drops below 60 FPS.