2 decent 2TB nvme drives in my case (there's been all sorts over the last 2/3 years though).
If you really want to "work it" I'd suggest the optimal performance for money option would be a 1 or 2TB high end NVMe for windows/boot/your currently most played AAA game (with cache, TLC nand, etc). A second, QLC, cacheless wonder, as big as you can afford for everything else
So
1TB Samsung 990/western SN850x/Crucial T700 for boot (that kinda tier of drive, there's other options)
1-4TB Crucial P3/etc for "big stuff" Like steam drive. Buy more if you have space/slots/wallet.
the cheaper drives slow to a crawl after a few tens/hundred GB of writes in a short time but.... that's not really going to be much trouble for something like a steam/movies drive. Generally write once/read many so capacity and read speeds are king.