I am planning to buy a system. I give Performance first place. I am a gamer and need some graphics too. Is AMD Sempron, Athlon or Duron the best? Which M/B to buy? And RAM? Give me all sorts of advices not to fall in any dillema or cheats. NB:Also when I used a system with MERCURY 400 W SMPS in my house, there was ELECTRIC SHOCKon the CPU. And on some other SMPS's not. The earthing of my home is well. The why?