The problem is - to achieve anywhere near equivalent results - PCVR needs a lot more brute forcing than closed boxes do - even during PSVR launch, the horsepower delta needed was substantial, and it's only going to be larger with PSVR2.I won't bother to scour ebay for old pascal deals, but, based on Richard's build, i would put a 6700XT in rather than the A770 for way better performances.
Basically - if you're fine with the lower-end performance anyway - you might as well only use Quest in standalone mode and save yourself the PC build alltogether. I get you miss out on some of the library - but the way people talk on here it's like it's just Alyx - and that's a tall order that much money for alone.