For your query about the technical aspect of the cameras, you may read the below links. I searched them just by typing D700 review in google.
I believe no one in the world knows what you need better than yourself. They can only help you by comparing the cameras and tell you the pros and cons. But this will be easier for you to do research on your own and ask what you do not know. Read up about everything you can find about the bodies, sit back have a cup of drink of your choice and think carefully of what you really need.
Hope the links below helps.
http://www.bythom.com Please search on the cameras in the site.
http://www.kenrockwell.comPlease search on the cameras in the site. Some people have bad comment about the person who set up the sites. Just read with an open mind.
http://www.dpreview.comPlease search on the cameras in the site.