1440p 144hz monitor's the best $400 I've ever thrown at a system. In retrospect Dell's GSYNC model was onsale recently for about $400 shipped, but even without GSYNC for Nvidia or Freesync for AMD (I own Nvidia) 144hz is yuuuuuge. As is a 27'' 1440p monitor!
Don't throw money away on old headsets yet, prices should start tanking when people convert up, or you can get the good headset instead.
Also, VR's gimmicky crap