http://www.mir.com.my/rb/photography...s/nikonf3ver2/

You see the "HP" in the bottom right corner of the finder? It tells you that this F3 has the "High-eye Point" finder (also known as DE-3; standard is DE-2). It's a bit bigger than the DE-2.
You don't have to get two cameras, just two finders because they are interchangeable.