Metro Last Light
“Metro: Last Light (formerly Metro 2034) is a first-person shooter and horror video game developed by Ukrainian studio 4A Games and published by Deep Silver for Microsoft Windows, PlayStation 3 and Xbox 360. It was released in May 2013. The game is set in a post-apocalyptic world and features a mixture of action-oriented and stealth gameplay. The game exists in the universe of the novel, Metro 2033, and its sequels, written by Russian author, Dmitry Glukhovsky, but does not follow any direct storylines from the books. Metro:Last Light takes place one year after the events of Metro 2033, proceeding from the canonical ending from the novel, ending where Artyom chose to call down the missile strike on the Dark Ones.Metro: Last Light features technology which boasts of lighting effects and improved physics claimed to set a new graphical benchmark on the PC and consoles.” From Wikipedia.org
at £125, it takes it into 7850 1gb territory, I concur with your conclusion, its certainly overpriced, and limited by that 128 bit bus width, for the same money you could get the 256 bit 7850 1gb, the memory throughput is so much better, and will allow the VRAM to be overclocked, SCAN has an MSI 7850 1gb for just £123.34, making this 2gb 7790 variant redundant.
http://www.scan.co.uk/products/1gb-msi-radeon-hd-7850-4800mhz-gddr5-28nm-gpu-860mhz-1024-cores-hdmi-2x-mdp-dl-dvi-i