I built my own pc in February 2008 (following the bit-tech hardware guide) for £800 and it still runs the latest games (e.g. Skyrim, Mass Effect 3, Call of Duty) perfectly well. The graphics card (8800 GT) stopped working a couple of days ago so I had to replace it. The lesson? Invest in decent gear and it will last you for years, buy cheap rubbish and you'll spend more money in the long run keeping it running.