Axiom Multiverse is out of the picture as it failed the most simple compile test. I downloaded the package and tried to compile it with Visual Studio 2008, but Multiverse doesn't include all the necessary codes to compile it. So the last native candidate is gone.
MOGRE does compile with Visual Studio 2008. It's another win by default and not necessarily by technical merit.
So it's either MOGRE or nothing. Nothing meaning, that I don't do the 3D in C# but instead opt for a separate C++ app that I myself bridge into C# or that communicates with the C# App.