Here is what I can get you without windows, plug in that GPU you have for now and save up for the 1060 when it releases, should perform on par with the 980 according to pricing and rumoured specs.
PCPartPicker part list:
http://uk.pcpartpicker.com/list/6cYZ8K
Price breakdown by merchant: http://uk.pcpartpicker.com/list/6cYZ8K/by_merchant/
CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor (£170.96 @ More Computers)
CPU Cooler: be quiet! SHADOW ROCK LP 51.4 CFM CPU Cooler (£33.59 @ Novatech)
Motherboard: MSI H110M Gaming Micro ATX LGA1151 Motherboard (£69.06 @ Amazon UK)
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-2133 Memory (£60.99 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£39.99 @ Amazon UK)
Case: NZXT S340 (Black/Red) ATX Mid Tower Case (£59.99 @ Novatech)
Power Supply: XFX TS 550W 80+ Gold Certified ATX Power Supply (£68.04 @ Amazon UK)
Total: £502.62
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-07-02 12:54 BST+0100