Better off getting a new z97 and 4790K as suggested. You don't want to buy an i7-980 - too much money. For £800 - buy new and sell your mobo.
-Bruce
PCPartPicker part list:
http://uk.pcpartpicker.com/p/KZzLdC
Price breakdown by merchant: http://uk.pcpartpicker.com/p/KZzLdC/by_merchant/
CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor (£239.94 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£22.63 @ Ebuyer)
Motherboard: Asus SABERTOOTH Z97 MARK2 ATX LGA1150 Motherboard (£119.96 @ Scan.co.uk)
Memory: G.Skill TridentX 16GB (2 x 8GB) DDR3-1866 Memory (£138.22 @ Ebuyer)
Total: £520.75
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-08-24 02:31 BST+0100