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I would spend that bit more and get this, 3GB of vRam, 384Bit Bus, 95% the performance of a GTX 770 and R9 280X.
VTX3D Radeon R9 280 3072MB £190
http://www.overclockers.co.uk/showproduct.php?prodid=GX-019-VX
Not bad but the only problem is dont have the budget till I've sold the 660
I was thinking the next step up would be the 760 but Ill need to see what kind of prices I find and warranty ext, Ill also need to see what performance increase I would get compared to my 660