If you really want to work in VR, you probably need one of the more specialized and expensive headsets. I've tried watching movies in my Index and it was functional, but there's no way it could legibly render text at a comfortable size. For what it's worth, because it might matter, I wear corrective lenses, so maybe I don't have the best optical setup.

Pimax and Bigscreen I think work hard for that market? Bigscreen has those neat goggles which I'd like to try. Rumors are that Valve is building another headset, with better specs. That might put pressure on that market.

For monitors, I must confess I am somewhat wrong. My 32inch (or something) LG monitor might have been $400, not $200. But I used a giant TV for years thinking I didn't need "nice" monitors and I was so wrong. 1440p and over 120hz refresh rate are so worth it, even for work tasks. When I bought it a couple years ago, the caveats were that it's a VA panel, so it has really bad ghosting. It's noticeable in games, but somehow has not ruined my experience. The other types of panels have their own drawbacks I think. OLED is the best non-compromise for image quality but then you will have to keep burn in at bay.

I like my LG monitor. My girlfriend's ASUS monitor is nice. I hear nice things about BenQ, but you're better off with review sites than my anecdotes.

My window management "trick" is that no window is full screen, and every window is overlapped such that there's always a sliver of the "under" window I can click even if that window is otherwise not in view. I also make significant use of alt-tab. I think people who use the multiple desktop feature of modern windows and mac have a much better system. One desktop per "Task" I think works really well.