Look into building with an AMD Ryzen Zen 3 and an nVidia GPU.

Newegg.com is a good place for this.

Choose the case wisely and don’t skimp on the power supply or cooling (I put a Noctua cooling fan system in my last build—the fan that comes with the chip is usually small).

The thing about building a machine is that you need to think about upgrading it in the future—so just plan for a big enough case and be sure the motherboard isn’t on it’s last version.