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I just did this for my wife. The iMac she got 10 years ago can't run modern games properly and isn't getting MacOS updates anymore. A Mac Mini with Thunderbolt video card + extra storage right now would be $1000-2000. I used http://pcpartpicker.com/ to help spec out an AMD Ryzen 5 build for $1000, that's very comparable with a topped-out Mac Mini 2018. Also stuck https://github.com/felixrieseberg/macintosh.js on there for nostalgia.

What parts did you choose? What display are you using?
 
What parts did you choose? What display are you using?

Sorry for the delayed response.
Edit, forgot to mention the Wifi. fenvi FV-AX3000
 
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