wow, you could have 3 way SLI with 3 of these:
PNY Quadro FX 6000 6GB DDR5 PCI-Express 384bit DVI
that would only set you back £10,763, leaving you a grand for the rest of the system.
or alternatively would you prefer:
ATI Radeon 6850 HD 775MHz 1GB PCI-Express HDMI for £120
GeForce GTX 550 Ti 1GHz 1GB PCI-Express HDMI GS (might be able to find an older but better GTX 460, but they are getting rare)http://www.tomshardware.co.uk/charts/2011-entry-level-graphics/Crysis-2-medium,2872.html