My house mate, who also bought a PC through here a couple of years ago, is having graphics issues, in that his screen keeps exhibiting "tearing" and flickering when playing games. It's become so bad it even does this when Windows is loading up. He's thinking of getting a repair guy to have a look at it, but in the event that it is the graphics card that is damaged, which would be a good replacement for it within a £50 - £100 range, with the aim of playing games like FFXIV or TESO or Skyrim on high settings?