Most budget and simplest to install MacOS

[alexnov]

Hey guys, please advice the most budget and simplest to install MacOS (High Sierra (Mojave)) hardware with a performance comparable to my current build. I need to fill the G5 case with some hardware .

 

[theruck]

https://www.tonymacx86.com/buyersguide/july/2017/#CustoMac_Budget_ATX without the graphics card