Canon used to have an advantage in image quality over Nikon, especially at high ISO.
With the introduction of the Nikon D80, this gap has narrowed.
The Nikon D80 features a Spot Meter, Auto-ISO and a brighter, more magnified viewfinder.
The Canon XTI 400D is lighter, has a dust-removal system and costs $200 less.
If you have Canon or Nikon lenses, your choice may be easy. If you are starting fresh, the digital SLR comparison chart above may help.
Please find some more information from selected merchants below.Note: Newegg has a Special Discounts on All Canon Digital Cameras (expires October 16, 2006)