If you can try both ATI and Nvidia. Just make sure you can get a refund. Your allways gona get someone that will say ATI is better or Nvidia is better. Just because it runs great on there system does not mean it will run good on yours. If I were you I would save my money because a 5200 would be just flushing your money. We have some new cards coming out like the XGI and that should bring ATI and Nvidia down a little I would think.
"keep The Faith"