I am making the move to digital and already have two digital cameras and will be looking for a third shortly.
Camera shots tend to show that Canon has better noise control particularly at high ISOs but sharpness slightly lower than Nikon's. Canon moves faster in the area of innovation and new products. Nikon has better sharpness but more noise. Nikon also is renowned for a solid build and an extensive series of lens and support products. Top lenses and flash units of both can be very expensive in comparison with third parties. The quality of original manufacturer lenses and support may be better or just advertising. You need to do the research to find out which it is.
It is indeed a difficult choice and unfortunately compromises have to be made with any product at any price level. You need to look at your style and the type of photography that you do, and sort out which would be the best quality, most comfortably designed product to meet your needs.
Ronnoco