3D Studio R3
I'll second Gary's comment that the DXF translator in 3D Studio is one of the
"best on the planet," short of AutoCAD itself. But AutoCAD isn't a renderer, so
that puts 3D Studio ahead of AutoCAD when it comes to 3D.
What exactly would you like to be able to do, when you convert a DXF to 3D
Studio? What extra options do you want?