Help build budget gaming system please :(

[Sret43rg]

Hello i have been given a new budget of £600-£650 to build a gaming pc and i'm not very good at building pcs myself so could anybody suggest me a system using UK prices from websites like Amazon.co.uk , Scan.co.uk , and cclonline.com preferably.
I DO NOT NEED ANYTHING APART FROM THE DESKTOP AND I DON'T NEED AN OPERATING SYSTEM.

Thank you in advance.

 

[g-unit1111]

Here you go:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3470 3.2GHz Quad-Core Processor (£143.38 @ Amazon UK)
Motherboard: ASRock H77 Pro4/MVP ATX LGA1155 Motherboard (£71.90 @ Amazon UK)
Memory: Mushkin Blackline 8GB (2 x 4GB) DDR3-1600 Memory (£39.28 @ Amazon UK)
Storage: Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive (£55.00 @ Ebuyer)
Video Card: MSI Radeon HD 7870 GHz Edition 2GB Video Card (£215.98 @ Scan.co.uk)
Case: NZXT Source 210 (White) ATX Mid Tower Case (£33.47 @ Scan.co.uk)
Power Supply: Corsair Enthusiast 650W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£70.15 @ Scan.co.uk)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£19.99 @ Overclockers.co.uk)
Total: £649.15
(Prices include shipping, taxes, and discounts when available.)

 

[Sret43rg]

I was able to find a 7950 for the same price as that MSI 7870 Hawk, would this be better? http://www.cclonline.com/product/89496/FX-795A-TDJC/Graphics-Cards/XFX-Radeon-HD-7950-Graphics-Card-3GB/VGA0749/

 

[g-unit1111]

I was able to find a 7950 for the same price as that MSI 7870 Hawk, would this be better? http://www.cclonline.com/product/89496/FX-795A-TDJC/Graphics-Cards/XFX-Radeon-HD-7950-Graphics-Card-3GB/VGA0749/

Definitely. Go for it.