I’d second the Pimax Crystal. I have it pre-ordered and can’t wait for it to arrive. The specs and what few reviews we have are, beta issues aside, very positive. Pimax is a small company who struggle to live up to release dates, but in VR image quality is paramount and the Crystal has it in spades and for a great deal less than the Varjo Aero.
At the moment the G2 and the Pico 4 (I own both) offer the best bang for the buck, but both come with issues, such as the disappointingly narrow sweet spot of the G2’s Fresnel lenses and the fact that the Pico 4 although it has nice pancake lenses, does not have a native display port connection and so comes with issues like compression artifacts using WiFi. Both have resolutions that is not as good as I want, whereas the Pimax and Aero do. The Aero is stupidly expensive and still needs tracking stations and headphones, unlike the Pimax.
Until VR matures and the likes of Nikon’s technical imaging division and/or Zeiss enter the market, headsets like the Crystal or Aero are the best we can hope for right now.