gustaboMy observation is that Radeon HD series seem solid and nVidia are hit and miss.
kevmsmith81Also, check graphics card compatibility with your CPU. I'm not 100% on this, but I read somewhere that if you have a Intel CPU that they work best with Nvidia graphics cards, and AMD work best with Radeon cards. You will also need to ensure your power supply unit can cope with the graphics card you choose. As I said, I'm no expert but these things are worth checking out.