Hi.
has anyone tried nvidia sxenix ? seems kinda promising - particularly since in the next version it will offer interactive raytracing - and supports many features. I can't tell for sure it's a 3D engine or something less ( a higher lvl API/wrapper to opengl, but not high enough to be considered an engine ).
edit: here are some links
http://developer.nvidia.com/object/scenix-home.html
http://developer.nvidia.com/object/scenix-details.html