I could in theory upgrade the power supply to go beyond the 150W target, but then I’d also need a better chassis because it is already quite warm with my current 130W card.
Hoping to stick with AMD, but if my wishes to play around with local LLMs and image upscaling makes Nvidia a more practical choice, I can live with that compromise.
Working with a budget of 200 US, I’m fine going with a used GPU.
If your big issue is just getting back into mainstream support, you can try looking for a 7600, since RDNA 3 is just one generation removed from the latest. You’ll have to undervolt or limit power and you’ll be stuck with 8GB on that budget but you’ll probably receive software support for slightly longer than the RDNA 2 6600/6700.