I will build you a 3.5k build and leave 500-700 for custom water cooling and other items you'd like.
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i7-6700K 4.0GHz Quad-Core Processor | $329.99 @ Micro Center |
| Motherboard | Asus Z170-A ATX LGA1151 Motherboard | $153.99 @ SuperBiiz |
| Memory | Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-2400 Memory | $96.99 @ Amazon |
| Storage | Samsung 850 EVO-Series 1TB 2.5" Solid State Drive | $343.98 @ OutletPC |
| Storage | Samsung 850 EVO-Series 1TB 2.5" Solid State Drive | $343.98 @ OutletPC |
| Video Card | MSI GeForce GTX 980 Ti 6GB Video Card (2-Way SLI) | $749.99 @ SuperBiiz |
| Video Card | MSI GeForce GTX 980 Ti 6GB Video Card (2-Way SLI) | $749.99 @ SuperBiiz |
| Power Supply | Corsair RM 1000W 80+ Gold Certified Fully-Modular ATX Power Supply | $119.99 @ Newegg |
| Monitor | Asus ROG SWIFT PG278Q 144Hz 27.0" Monitor | $669.99 @ Amazon |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $3638.89 | |
| Mail-in rebates | -$80.00 | |
| Total | $3558.89 | |
| Generated by PCPartPicker 2015-11-19 23:42 EST-0500 |
GO TO A PROFESSIONAL COMPANY. I will NOT choose as good as a professional, don't go to Bestbuy for it. Look for people who build custom PC lists and I would do custom water cooling for sure. This will do 1440p 144hz, the case WIn Tou is crazy ass expensive and is not in PCpartpicker, you'd need to custom order it. I wouldn't even do this because you can spend 4k a lot of ways that does 4k gaming and 1440p 144hz.