high performance

So my brother wants me to build him a PC, he was looking at the $14,000 iMac pro, but I told him I could do something similar for much cheaper. My parts list is as follows Intel Core i9-7980XE Corsair H115i Asus Prime X299-Deluxe 128gb Corsair Dominator Platnum 3200 Phanteks Enthoo Pro Full...