Her you go man. For gaming there is no need for an I7, because you will not take advantage of the Hyper threading of the i7 in games so that will save you 100 quid unless you want to be one of those guys that just have to have an I7 to say they have one.
PCPartPicker part list:
http://uk.pcpartpicker.com/p/3xDNj
Price breakdown by merchant: http://uk.pcpartpicker.com/p/3xDNj/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/3xDNj/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£161.94 @ Scan.co.uk)
CPU Cooler: Corsair H105 73.0 CFM Liquid CPU Cooler (£79.99 @ Ebuyer)
Motherboard: Gigabyte GA-Z87X-UD3H ATX LGA1150 Motherboard (£121.00 @ Amazon UK)
Memory: Corsair Vengeance Pro 8GB (2 x 4GB) DDR3-1866 Memory (£66.24 @ Ebuyer)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk (£58.00 @ Amazon UK)
Video Card: EVGA GeForce GTX 780 Ti 3GB Superclocked Video Card (£529.99 @ Dabs)
Case: Corsair 750D ATX Full Tower Case (£122.39 @ CCL Computers)
Power Supply: Corsair RM 850W 80+ Gold Certified Fully-Modular ATX Power Supply (£99.98 @ Ebuyer)
Case Fan: Corsair Air Series SP120 Quiet Edition (2-Pack) 37.9 CFM 120mm Fans (£17.99 @ Ebuyer)
Total: £1257.52
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-24 15:54 BST+0100)