I currently have a PC that has a Intel i5-6500, Nvidia GTK 1060 3GB, HyperX Fury 8GB. The power supply I have is Corsair VS550w, but it recently broke, and no longer works. So I am currently using a secondary old cheap power supply I had laying around, that is 450w, and it doesn't have a PCI-e adapter, so I can't connect my GPU to it, so at the moment I'm only using IGPU. I am thinking of upgrading my machine in the near future as well to probably a AMD Ryzen 7 5000 series and 16GB ram GPU might stay the same for the time. But if I'll get a new I'll go with a 1660 or 2060, somewhere in the xx60 series. I'm wondering how much watt power supply should I get now, for future proofing? should I go with 550w or higher? As I do need to buy a power supply right now because I need my GPU to work.
How much overhead you want above this depends on on several factors, some of which are discussed, and some of which are built into the calculator sites.