There are lots of deals currently on PCs that will run CoX just fine. Build one ourselves or tweak an off-the-shelf.
Look for an SSD, add some RAM, maybe a quieter fan or two and we're off an running.
This is all I use, nothing spectacular then upgraded to 32GB ddr4 and a f9 silent fan.
HP Pavilion 690 Gaming Desktop
Intel Core i5-9400F upto 4.1GHz
8GB RAM
256GB NVMe SSD
NVIDIA GeForce GTX 1660 Ti