In the past few months, we have covered plenty of cool water custom PCs here. The Cougar Conquer PC is also pretty cool. It is a $6000 water cooled gaming PC with plenty of power for gaming and other resource-intensive tasks. This video shows a time lapse of it being built:
You are going to need an Intel Core i7 8700k, 480GB SSD, 32 GB RAM, GTX 1080 GPU, Bitspower Water Cooling, and a few other components to build this specific version.