Bought a Rift last week. It's the most amazing piece of hardware I've ever owned, sure the resolution could be a little higher and both the sensors and headset could be wireless, but my god is it good! I love both seated games and room scaling games, I only have a 2 sensor setup and it needs adjusting, but I'm really happy with it so far. Buy either the Rift or Vive and enjoy!
If your not too botherd about room scaling and standing up experiences then get a Rift, you could always add sensors *WHEN* you decide that you want to play something else!
VR is incredible, and is here to stay
I only have a humble fx8350 and a r9-290, so far I haven't had a problem playing anything I have tried