I don't know much about hardware so I'd like some advice before I risk buying something that doesn't properly work with Linux and I'm not sure where to look, so hopefully some of you can guide me along :)

I've been running a GTX 560 since about 2012 and it already struggled with some of the games I was interested in, so just about anything would be an upgrade. Roughly looking to pay 250 USD to get a nice mid-range replacement for less-than-1080p gaming, and I'm used to and not much bothered by FPS's in the 20-30 range. Essentially I want current games to look good and run without stutter or overheating. There aren't too many 3D games in my wishlist at the moment so I'm not sure what to aim for, but I looked at some 1060's and 1660's on newegg and they seem to tick all the boxes regarding price and performance, while reportedly also being reasonably quiet and cool.

My main questions would be:
1. Can I expect those to be well supported on Linux (Mint for the foreseeable future)? I assume they are Vulkan-ready, unlike my current one.
2. Is there something better I should look at in that price range? I'd like to stick with what I know (nvidia), but I'm not completely closed to an open-sourced brand, as long as there are other compelling reasons to choose them and they are hassle-free and equally compatible. When it comes to GPUs, I'm willing to put usability above openness.

Thanks in advance :)