I very much appreciate the responses! I have bookmarked DXOmark and have read what they offer. I have also found that reading brochures for cameras, like the one for the D800, offer good imaging information.
My follow-up question would be: If the sensors are pretty similar in design and function, is it the camera processor (Expeed 3, DIGIC 4) that has more effect on the image? When comparing the image capture devices on cameras, should I be focusing on the processor over the sensor?
Thank you again for your help!