The build I've assembled:
PCPartPicker part list: http://uk.pcpartpicker.com/p/2ntUC
Price breakdown by merchant: http://uk.pcpartpicker.com/p/2ntUC/by_merchant/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£166.90 @ Amazon UK)
Motherboard: ASRock Z87 Extreme3 ATX LGA1150 Motherboard (£77.50 @ Amazon UK)
Memory: Crucial Ballistix Sport 8GB (1 x 8GB) DDR3-1600 Memory (£57.47 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£42.00 @ Aria PC)
Video Card: Gigabyte Radeon R9 280X 3GB Video Card (£225.72 @ Dabs)
Case: Zalman Z11 Plus ATX Mid Tower Case (£47.98 @ Amazon UK)
Power Supply: Fractal Design Integra R2 650W 80+ Bronze Certified ATX Power Supply (£54.29 @ CCL Computers)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£11.98 @ Ebuyer)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) (£86.76 @ Amazon UK)
Total: £770.60
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-21 00:15 GMT+0000)
I already have a keyboard and mouse, the rig will be used for gaming and light general use, I do plan on overclocking but I'll be getting a aftermarket CPU cooler later down the line, it's the same with a SSD, I'll only be playing at 1080p on the near future and I need a OS and a optical drive.