Best bang for buck GPU for Q2 2026?

Currently trying to replace a 1650 in a previous build, my budget is under $500. I don't mind going the used route especially if it nets me something really high-end that'll last me a long while.

Preferably, two or three plus years. I will be mainly gaming in 1440 or 4K. what are the best GPU at the moment that I could use? And, I am considering a b580, but although I don't know if it would work best for my case. The price is very attractive to me.

But I don't mind buying a used 3080, if I can get it for a good price as well. I am located in California. what are my options?