I would suggest to go with Intel. It will give you an upgrade path to i5 or even i7.
PCPartPicker part list:
http://uk.pcpartpicker.com/p/DTdqnQ
Price breakdown by merchant: http://uk.pcpartpicker.com/p/DTdqnQ/by_merchant/
CPU: Intel Core i3-4170 3.7GHz Dual-Core Processor (£88.20 @ Aria PC)
Motherboard: Gigabyte GA-H97M-D3H Micro ATX LGA1150 Motherboard (£69.00 @ Aria PC)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1600 Memory (£35.60 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£30.98 @ Aria PC)
Video Card: Asus Radeon R9 270 2GB DirectCU II Video Card (£119.98 @ Dabs)
Case: Zalman ZM-T4 MicroATX Mini Tower Case (£14.99 @ Novatech)
Power Supply: EVGA 500W 80+ Certifie6d ATX Power Supply (£29.95 @ CCL Computers)
Total: £388.70
Prices include shipping, taxes, and discounts when available
Also, Radeon R9 270 is better than GTX 960.
http://www.hwcompare.com/18413/geforce-gtx-960-vs-radeon-r9-270/
Build 2 : More Budget Friendly
PCPartPicker part list:
http://uk.pcpartpicker.com/p/3NJwQ7
Price breakdown by merchant: http://uk.pcpartpicker.com/p/3NJwQ7/by_merchant/
CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor (£51.54 @ Scan.co.uk)
Motherboard: Gigabyte GA-H97M-HD3 Micro ATX LGA1150 Motherboard (£64.80 @ Aria PC)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1600 Memory (£35.60 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£30.98 @ Aria PC)
Video Card: Asus Radeon R9 270 2GB DirectCU II Video Card (£119.98 @ Dabs)
Case: Zalman ZM-T4 MicroATX Mini Tower Case (£14.99 @ Novatech)
Power Supply: XFX ProSeries 450W 80+ Bronze Certified ATX Power Supply (£36.40 @ Ebuyer)
Total: £354.29
Prices include shipping, taxes, and discounts when available