Besides the Index and the Quest 2, what good VR headsets are there? My friend wants to get into VR, but he's not interested in the Quest 2 because Facebook requirements and the Index is, unless I'm mistaken, the most expensive option as far as complete kits get, and you're gonna have to wait 3+ months for it to show up.

What else is going to be easily attainable and actually good, is the Reverb G2 just going to be an inside-out "Index Lite" more or less when it comes out? Do we have an actual release date for the Reverb G2?
I guess the Deca-Gear looks promising, I don't know much about modern Vives, but the one my friend bought four years ago was pretty cool. 
Are the Index and the Reverb G2 the only ones with self-contained speaker systems?