You don't have to go retro, just 5 to 10y old is fine.

I too built a budget gaming machine last year with a ryzen whatever it is cpu, 16GB of DDR4 and a radeon rx470 or 489 with 8GB of ram. I ignore news about new games and only buy games that are on sale and less than 20€ and everything works fine. These are AAA but not newly released ones. For example I recently started playing Skyrim for example.

You don't miss what you haven't tried.