PCPartPicker part list:
http://uk.pcpartpicker.com/p/86gLxr
Price breakdown by merchant: http://uk.pcpartpicker.com/p/86gLxr/by_merchant/
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor (£184.66 @ Ebuyer)
Motherboard: Asus Z97-A ATX LGA1150 Motherboard (£110.24 @ Ebuyer)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£53.49 @ Amazon UK)
Storage: Crucial MX100 128GB 2.5" Solid State Drive (£53.42 @ Scan.co.uk)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£42.65 @ Amazon UK)
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card (£274.98 @ Amazon UK)
Case: Fractal Design Define R5 w/Window (Black) ATX Mid Tower Case (£85.62 @ Amazon UK)
Power Supply: EVGA SuperNOVA NEX 650W 80+ Gold Certified Fully-Modular ATX Power Supply (£63.31 @ Amazon UK)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£10.16 @ CCL Computers)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) (£76.50 @ Amazon UK)
Monitor: BenQ GL2460HM 60Hz 24.0" Monitor (£114.99 @ Amazon UK)
Total: £1070.02
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-05-03 20:12 BST+0100
trust me the PSU and mobo change is worth it.
MSI has made many defective motherboards
and the PSU you had originally selected isn't made for gaming PC's.