>>350884958
Yes you can play most vr games while seated, though it can be a pain. There's a plugin for SteamVR that lets you playspace move, effectively allowing you to change your height above playspace in vr without needing to move. As long as you don't thrash around while playing that will do you.
Also as a side note, you really don't need that much space for VR. Many here have made do with a < 1m^2 space, myself included.

Quest 2 is the best budget option. For real PCVR you'll want either a competent modern router, or a link cable. It's fine as an entry level headset but if you're more enthusiastic then an Index is probably the best overall headset on the market.
If you do mainly play vrchat you might want to eventually get FBT, which lets your legs and hips be tracked (this is very good for cuddles, highly recommend). You can do FBT with Quest but, honestly, at that point just upgrade to Index.

>>350885243
Yes, but you will still need a VR capable PC, and a link cable for wired VR or a good router for wireless VR. Otherwise you're in standalone questlet mode