Hi I am a complete novice when it comes to building computers but want to have a go at building a good gaming desktop for up to £800 (less if possible). I want to be able to play lots of games such as Guild Wars 2, Civilisations 5, Bioshock Infinite, Skyrim and so on. Could someone please suggest a good spec so that I can just put it all together? Any help or suggestions will be gratefully received. Thanks.