Is this a good build?

Solution
Cheaper RAM (higher latency, but you will never notice it), better motherboard, an aftermarket CPU cooler, a better GPU, and a cheaper CPU that can be overclocked to match the FX-8350 (there should be no need for that though):

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-8320 3.5GHz 8-Core Processor (£101.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.24 @ CCL Computers)
Motherboard: Gigabyte GA-970A-D3P ATX AM3+/AM3 Motherboard (£64.76 @ Scan.co.uk)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£55.34 @ Scan.co.uk)
Storage: Western Digital...
If overclocking, then get the Asus M5A97 R2.0 motherboard and the cpu cooler.
If not see if you can fit the cpu cooler, the stock AMD cooler is noisy when under load.
Also swapped to Gskill 2133 MHZ and it is cheaper.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-8350 4.0GHz 8-Core Processor (£128.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.24 @ CCL Computers)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard (£61.99 @ Dabs)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory (£56.71 @ Ebuyer)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£39.50 @ Amazon UK)
Video Card: MSI GeForce GTX 760 2GB TWIN FROZR Video Card (£176.11 @ Scan.co.uk)
Case: Corsair 300R ATX Mid Tower Case (£59.99 @ Amazon UK)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£46.98 @ Aria PC)
Optical Drive: LG UH12NS30 Blu-Ray Reader, DVD/CD Writer (£41.70 @ Aria PC)
Total: £637.21
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-10 17:04 BST+0100)
 
Cheaper RAM (higher latency, but you will never notice it), better motherboard, an aftermarket CPU cooler, a better GPU, and a cheaper CPU that can be overclocked to match the FX-8350 (there should be no need for that though):

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-8320 3.5GHz 8-Core Processor (£101.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.24 @ CCL Computers)
Motherboard: Gigabyte GA-970A-D3P ATX AM3+/AM3 Motherboard (£64.76 @ Scan.co.uk)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£55.34 @ Scan.co.uk)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£39.50 @ Amazon UK)
Video Card: MSI Radeon R9 280 3GB TWIN FROZR Video Card (£186.82 @ Scan.co.uk)
Case: Corsair 300R ATX Mid Tower Case (£59.99 @ Amazon UK)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£46.98 @ Aria PC)
Optical Drive: LG UH12NS30 Blu-Ray Reader, DVD/CD Writer (£41.70 @ Aria PC)
Total: £622.32
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-10 17:05 BST+0100)
 
Solution
Thanks for the replies. Also I just realised that the ASUS M5A97 motherboard doesn't actually have 3.0 headers, if I were to change my mobo to suit the original set up, possibly, what should I get?
 


the GA-970A-UD3P is cheap and will suit your needs.
 
I would go for something like this:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-8320 3.5GHz 8-Core Processor (£101.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.45 @ Scan.co.uk)
Motherboard: Asus M5A99FX PRO R2.0 ATX AM3+ Motherboard (£99.99 @ Amazon UK)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£55.34 @ Scan.co.uk)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£40.31 @ Amazon UK)
Video Card: MSI Radeon R9 280 3GB TWIN FROZR Video Card (£186.82 @ Scan.co.uk)
Case: Corsair 300R ATX Mid Tower Case (£59.98 @ Amazon UK)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£46.98 @ Aria PC)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.74 @ CCL Computers)
Total: £628.60
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-12 06:50 BST+0100)

If you are willing to ditch the blu-ray drive to a normal, cheap dvd drive, you can get a 990FX chipset which will allow you to overclock the FX-8320 better.