Here is one I have just made up
PCPartPicker part list:
http://uk.pcpartpicker.com/p/32RyO
Price breakdown by merchant: http://uk.pcpartpicker.com/p/32RyO/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/32RyO/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£166.68 @ Aria PC)
Motherboard: Asus Z87-A ATX LGA1150 Motherboard (£101.98 @ Dabs)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£78.96 @ Scan.co.uk)
Storage: Samsung 840 EVO 250GB 2.5" Solid State Disk (£109.59 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£43.54 @ Amazon UK)
Video Card: Gigabyte GeForce GTX 770 2GB Video Card (£249.99 @ Ebuyer)
Power Supply: Corsair CX 750W 80+ Bronze Certified Semi-Modular ATX Power Supply (£68.98 @ Amazon UK)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£11.78 @ CCL Computers)
Total: £831.50
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-02 19:00 GMT+0000)
It should be able to play many new games on high, if you want to upgrade to the next GPU (GTX 780) the price jumps a bit