Here's an i7 4770k build I configured for you:
PCPartPicker part list:
http://uk.pcpartpicker.com/p/2uSsT
Price breakdown by merchant: http://uk.pcpartpicker.com/p/2uSsT/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/2uSsT/benchmarks/
CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor (£250.43 @ Ebuyer)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler (£57.89 @ Ebuyer)
Motherboard: Asus Z87-A ATX LGA1150 Motherboard (£106.64 @ Scan.co.uk)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory (£59.95 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: Zotac GeForce GTX 770 4GB Video Card (£287.72 @ Scan.co.uk)
Case: NZXT Source 210 Elite (White) ATX Mid Tower Case (£38.64 @ Scan.co.uk)
Power Supply: XFX 750W 80+ Bronze Certified Semi-Modular ATX Power Supply (£80.00 @ Ebuyer)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£11.98 @ Ebuyer)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£72.59 @ Ebuyer)
Total: £1008.83
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-03 14:12 GMT+0000)
It should max out most of the current titles and it will have that performance you want for rendering.
Here's an i5 4670k build:
PCPartPicker part list:
http://uk.pcpartpicker.com/p/2uSw3
Price breakdown by merchant: http://uk.pcpartpicker.com/p/2uSw3/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/2uSw3/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£173.82 @ Aria PC)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler (£57.89 @ Ebuyer)
Motherboard: Asus Z87-A ATX LGA1150 Motherboard (£106.64 @ Scan.co.uk)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory (£59.95 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: MSI GeForce GTX 780 3GB Video Card (£369.59 @ Overclockers.co.uk)
Case: NZXT Source 210 Elite (White) ATX Mid Tower Case (£38.64 @ Scan.co.uk)
Power Supply: XFX 750W 80+ Bronze Certified Semi-Modular ATX Power Supply (£80.00 @ Amazon UK)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£11.98 @ Ebuyer)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£72.59 @ Ebuyer)
Total: £1014.09
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-03 14:15 GMT+0000)
It has a better graphics card (should max out everything on the market), CPU will perform very similarly in gaming but will be slightly worse for video editing/rendering.
And here's an AMD FX 8350 build, also with the GTX 780:
PCPartPicker part list:
http://uk.pcpartpicker.com/p/2uSyK
Price breakdown by merchant: http://uk.pcpartpicker.com/p/2uSyK/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/2uSyK/benchmarks/
CPU: AMD FX-8350 4.0GHz 8-Core Processor (£137.00 @ Ebuyer)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler (£57.89 @ Ebuyer)
Motherboard: Gigabyte GA-990FXA-UD5 ATX AM3+ Motherboard (£122.00 @ Amazon UK)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory (£59.95 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: MSI GeForce GTX 780 3GB Video Card (£369.59 @ Overclockers.co.uk)
Case: NZXT Source 210 Elite (White) ATX Mid Tower Case (£38.64 @ Scan.co.uk)
Power Supply: XFX 750W 80+ Bronze Certified Semi-Modular ATX Power Supply (£80.00 @ Amazon UK)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£11.98 @ Ebuyer)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£72.59 @ Ebuyer)
Total: £992