GTX 1080 is overkill for WoW even with 1440p. If you're overclocking I suggest this build:
PCPartPicker part list / Price breakdown by merchant
CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor (€238.89 @ Amazon Deutschland)
CPU Cooler: be quiet! Dark Rock Pro 3 67.8 CFM Fluid Dynamic Bearing CPU Cooler (€76.99 @ Aquatuning)
Motherboard: ASRock Fatal1ty Z170 Gaming K4 ATX LGA1151 Motherboard (€127.04 @ Mindfactory)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-3000 Memory (€80.84 @ Mindfactory)
Storage: Samsung 850 EVO-Series 500GB 2.5" Solid State Drive (€146.93 @ Mindfactory)
Video Card: Gigabyte GeForce GTX 1070 8GB Windforce OC Video Card (€476.99 @ Amazon Deutschland)
Case: Fractal Design Define R5 (Black) ATX Mid Tower Case (€101.04 @ Amazon Deutschland)
Power Supply: XFX XTR 650W 80+ Gold Certified Fully-Modular ATX Power Supply (€97.68 @ Amazon Deutschland)
Total: €1346.40
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-07-13 17:38 CEST+0200