Figured it was time to get a new machine, what I'm thinking:
CPU Intel Core i5-2500K 3.3GHz Quad-Core Processor £167.99 @ Novatech http://www.novatech.co.uk/products/comp ... n=products
FAN Cooler Master RR-V6GT-22PK-R1 93.7 CFM CPU Cooler £33.08 @ Scan http://www.scan.co.uk/products/coolerma ... 156-1366-a
MB ASRock Z68 Extreme3 Gen3 Intel Z68 £115.99 @ Novatech http://www.novatech.co.uk/products/comp ... n=products
RAM G-Skill 8GB (2x4GB) DDR3 1600MHz RipjawsX CL7 £79.66 @ Ebuyer http://www.ebuyer.com/274059-g-skill-8g ... cl7d-8gbxh
GFX Gigabyte ATI Radeon 7970 HD 925MHz 3GB £439.99 @ Dabs http://www.dabs.com/products/gigabyte-a ... ntent=TB00
PSU Corsair 750W ATX12V / EPS12V £115.12 @ Ebuyer http://www.ebuyer.com/164950-corsair-75 ... su-750hxuk
Case Corsair Carbide 500R Black Case £85.20 @ Ebuyer http://www.ebuyer.com/276071-corsair-ca ... m=products
TOTAL: £1037.03
Tempted to wait for a non-reference 7970 to hit the UK market, but I have no idea how long that wait will be.