a good £800 gaming build?

PCPartPicker part list: http://uk.pcpartpicker.com/p/3babc
Price breakdown by merchant: http://uk.pcpartpicker.com/p/3babc/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/3babc/benchmarks/

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£161.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.44 @ Aria PC)
Motherboard: Gigabyte GA-Z87-HD3 ATX LGA1150 Motherboard (£78.22 @ Amazon UK)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory (£62.79 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: MSI GeForce GTX 770 2GB Video Card (£238.52 @ Scan.co.uk)
Case: Cooler Master HAF 912 Plus ATX Mid Tower Case (£62.29 @ Scan.co.uk)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£44.98 @ Amazon UK)
Optical Drive: Lite-On iHDS118-04 DVD/CD Drive (£10.78 @ Scan.co.uk)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£11.78 @ CCL Computers)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£69.96 @ CCL Computers)
Total: £809.74
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-17 01:26 GMT+0000)
 
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£161.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.44 @ Aria PC)
Motherboard: Asus Z87-K ATX LGA1150 Motherboard (£89.96 @ Ebuyer)
Memory: Patriot Viper 3 Low Profile Black 8GB (2 x 4GB) DDR3-1600 Memory (£60.16 @ Ebuyer)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: Asus GeForce GTX 770 2GB Video Card (£242.90 @ Amazon UK)
Case: Zalman Z5 Plus ATX Mid Tower Case (£38.68 @ Scan.co.uk)
Power Supply: EVGA SuperNOVA 650W 80+ Gold Certified Fully-Modular ATX Power Supply (£64.99 @ Amazon UK)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.79 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£69.96 @ CCL Computers)
Total: £808.86
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-17 04:44 GMT+0000)

OR


PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-8350 4.0GHz 8-Core Processor (£131.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.44 @ Aria PC)
Motherboard: Asus SABERTOOTH 990FX R2.0 ATX AM3+ Motherboard (£114.90 @ Amazon UK)
Memory: Patriot Viper 3 Low Profile Black 8GB (2 x 4GB) DDR3-1600 Memory (£60.16 @ Ebuyer)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: Asus GeForce GTX 770 2GB Video Card (£242.90 @ Amazon UK)
Case: Zalman Z5 Plus ATX Mid Tower Case (£38.68 @ Scan.co.uk)
Power Supply: EVGA SuperNOVA 650W 80+ Gold Certified Fully-Modular ATX Power Supply (£64.99 @ Amazon UK)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.79 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£69.96 @ CCL Computers)
Total: £803.80
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-17 04:45 GMT+0000)