Here's a Build suggestion that should perform well within that budget range:
CGDirector.com Parts List:
https://www.cgdirector.com/pc-builder/?=Br1xh0y0Iqp
CPU: AMD Ryzen 5 3600X 3.8GHz 6-Core Processor ($206.99)
CPU Cooler: AMD Wraith Spire Cooler (Included with CPU) (-)
Motherboard: Gigabyte B550 Aorus Pro AC ATX AM4 ($189.99)
GPU: Nvidia GTX 1660TI 6GB - Gigabyte Windforce ($289.99)
Memory: 16GB (2 x 8GB) Corsair Vengeance LPX DDR4-3200 C16 ($68.99)
Storage PCIe-SSD: ADATA XPG SX8200 Pro 512GB NVME M.2 Solid State Drive ($74.99)
Power Supply: Corsair CX Series CX450M 450W ATX 2.4 Power Supply ($78.98)
Case: Lian Li LANCOOL 205 Mid Tower Case ($94.99)
Total: $1004.92
Let me know if you have any other questions!
Cheers,
Alex