You don't need a water cooler for that CPU, it's already running very fast and won't overclock more than ~0.3 ghz. I'd add a silent Noctua cooler instead but since you have 2x GPU's, it won't really matter.
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i7-4790K 4.0GHz Quad-Core Processor | $489.00 @ 1stWave Technologies |
| CPU Cooler | Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler | $54.00 @ 1stWave Technologies |
| Motherboard | Asus Z97 PRO GAMER ATX LGA1150 Motherboard | $263.00 @ Paradigm PCs |
| Memory | Kingston Beast 16GB (2 x 8GB) DDR3-1600 Memory | $214.00 @ Paradigm PCs |
| Storage | Crucial M550 128GB M.2-2280 Solid State Drive | $182.85 @ PB Technologies |
| Video Card | Gigabyte GeForce GTX 980 4GB WINDFORCE 3X Video Card (2-Way SLI) | $849.95 @ Computer Lounge |
| Video Card | Gigabyte GeForce GTX 980 4GB WINDFORCE 3X Video Card (2-Way SLI) | $849.95 @ Computer Lounge |
| Case | NZXT H440 (Orange/Black) ATX Mid Tower Case | $219.00 @ 1stWave Technologies |
| Power Supply | Cooler Master VSM 750W 80+ Gold Certified Semi-Modular ATX Power Supply | $189.00 @ PC Force |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | $3310.75 | |
| Generated by PCPartPicker 2015-02-19 21:29 NZDT+1300 |