If you were build a 4K machine to 5 box WoW on ultra ...

[Hor]

Origin PC is another option, or from a trusted builder. You could probably save some cash getting someone you trust to build one for you.

[MiRai]

Origin PC is another option, or from a trusted builder.

I didn't even think of Origin, but I was able to create an even more expensive build over there since they offer true liquid cooling options.

• Power Supply: 1.3 Kilowatt EVGA SuperNOVA G2
• Motherboard: MSI X99A GODLIKE Gaming Carbon
• System Cooling: ORIGIN CRYOGENIC Stage III Liquid Cooling
• Processors: Intel Core i7 6900K Octa-Core 3.2GHz (3.7GHz TurboBoost)
• Graphic Cards: Dual ORIGIN CRYOGENIC Liquid Cooling 8GB NVIDIA GeForce GTX 1080 Founders Edition
• Memory: 64GB Corsair Dominator Platinum 3000MHz (4 X 16GB)
• Operating System: MS Windows 10 Home
• Operating System Drive #1 (Primary): 256GB Samsung 950 Pro PCIe m.2
• Operating System Drive #2: 2TB Samsung 850 Evo Series
• Hot Swap Bay Drive #1: 2TB Samsung 850 Evo Series
• Hot Swap Bay Drive #2: 2TB Samsung 850 Evo Series
• Audio: On Board High Definition 8-Channel Audio
• Capture Cards: Elgato Game Capture HD60 Pro
• Warranty: Lifetime 24/7 U.S. Based Support and Lifetime Free Labor. 3 Year Part Replacement & Free Shipping Warranty

Went with EVOs because they're cheaper, but feel free to mix and match storage drives as you please. I also accounted for a ~$600 large-scale 4K display by adding multiple monitors which total up to that, but you'll still have to get one elsewhere.

The total overall price for the Origin build was just shy of $10,000. >_>