Looking at your build there are a couple of suggestions I might make. First, getting 1866 ram will not actually do you much good for gaming. The 1600 is much cheaper, and you wouldn't notice an increase in gaming performance unless you went up to 2400Mhz I'd say.
Your power supply is going to have to be excellent, and I don't have a problem with wattage but I found a good price on one that is better for not much diff in price. Here is a build with my suggestions:
PCPartPicker part list:
http://uk.pcpartpicker.com/p/GkzmNG
Price breakdown by merchant: http://uk.pcpartpicker.com/p/GkzmNG/by_merchant/
CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor (£236.34 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£24.86 @ CCL Computers)
Motherboard: MSI Z97-G45 Gaming ATX LGA1150 Motherboard (£86.36 @ Scan.co.uk)
Memory: Mushkin Blackline 16GB (2 x 8GB) DDR3-1600 Memory (£113.99 @ Aria PC)
Storage: Samsung 840 EVO 250GB 2.5" Solid State Drive (£83.99 @ Amazon UK)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive (£49.98 @ Aria PC)
Video Card: Asus Radeon R9 290 4GB Video Card (2-Way CrossFire) (£329.71 @ Amazon UK)
Video Card: Asus Radeon R9 290 4GB Video Card (2-Way CrossFire) (£329.71 @ Amazon UK)
Case: Phanteks Enthoo Pro ATX Full Tower Case (£87.13 @ Scan.co.uk)
Power Supply: EVGA SuperNOVA 1000 P2 1000W 80+ Platinum Certified Fully-Modular ATX Power Supply (£139.82 @ Amazon UK)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£10.22 @ CCL Computers)
Case Fan: Corsair SP140 49.5 CFM 140mm Fans (£19.37 @ Scan.co.uk)
Case Fan: Corsair SP140 49.5 CFM 140mm Fans (£19.37 @ Scan.co.uk)
Total: £1530.85
I've kept your air cooling solution but again, if you just don't feel comfortable with it then grab the 120V for not much more. BTW I love your case, it's the same one I have! I ordered one extra 140mm chassis fan for exhaust, but two is great if you don't mind just a bit more noise.
J