The build is good, only good tho, IMO you can do better for a bit more money. So here goes...
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i7-6700K 4.0GHz Quad-Core Processor (£323.99 @ Aria PC)
CPU Cooler: Corsair H100i GTX 70.7 CFM Liquid CPU Cooler (£86.98 @ Dabs)
Motherboard: Gigabyte GA-Z170X-Gaming 7 ATX LGA1151 Motherboard (£159.99 @ Amazon UK)
Memory: Corsair Vengeance LPX 32GB (2 x 16GB) DDR4-2666 Memory (£189.59 @ Overclockers.co.uk)
Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive (£58.79 @ Aria PC)
Storage: Western Digital Black 6TB 3.5" 7200RPM Internal Hard Drive (£209.98 @ Dabs)
Video Card: Gigabyte GeForce GTX 980 Ti 6GB Video Card (£529.99 @ Amazon UK)
Case: Corsair Air 540 ATX Mid Tower Case (£119.78 @ More Computers)
Power Supply: EVGA 750W 80+ Gold Certified Fully-Modular ATX Power Supply (£87.95 @ Amazon UK)
Wireless Network Adapter: Edimax EW-7811UTC 802.11a/b/g/n/ac USB 2.0 Wi-Fi Adapter (£12.99 @ Amazon UK)
Total: £1780.03
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-11-30 17:53 GMT+0000
6700K because it's newer and slightly better than the 4790K, allows for more PCI lanes etc
2x16GB for RAM, the MOBO allows up to 64GB, so having your 32 like this allows for an upgrae to 64 later.
MOBO is great and I like it, guess it's kinda personal preference
Storage is same as yours, good job and great deal with the WD black, buy it soon because it WILL go up (black friday deal?)
980Ti is one of the best and you can afford it. 980 falls into a category where the price to performance isnt great, and a 970 would be much wiser, or the 980Ti if you can afford it (larger VRAM)
Case isn't too expensive, id recomend a cheaper case than the one you had selected IMO, but it's only your personal preference
EVGA power supplies are the best, just check JonnyGuru to get that confirmed
Standard wifi
I WILL FIND A LINK FOR WINDOWS 7 OR WHATEVER VERSION YOU WANT
They're about £15 on eBay and it'll save you a lot of money. They're fine, I've had at least 3 for my different PC's, never had a problem, and they're all covered by eBay Guarantee anyway
Any questions just ask