Don’t want to run macOS Crapalina?
Here is one great choice:
Will it be as fast as a 2019 iMac 5K? No, not on many tasks, but if all 10 CPU core are used and/or GPU and/or lots of memory is required, it will rock and it doesn’t have to run macOS Mojave or macOS Crapalina. And it is better engineered for cooling/fans/noise. Very solid choice.