You may want to look into the lenses you may want to use. Do research and figure it out that way. You'll probably be changing boddies sooner or later and the lenses you've spent thousands of dollars on will probably determine which manufacture you'll be using. You also need to try the cameras out. I have the D200. A fairly large and heavy camera. It may not feel comfortable to most, my wife hates it, but I like the balance of it, even with longer lenses.