Modo is a great program. I have been using it for production work for more than 6 months now without major complains. Modo 203 has a dxf importer but it is far from perfect. I use AccuTrans.
http://forums.luxology.com/discussio...show=accutrans
I do not use xfrog or onyx but you can find some info here:
http://forums.luxology.com/discussio...907&show=XFrog
RPC content is not supported. The snap systme in Modo 203 is not perfect but it will be greatly improved in Modo 301. 301 will also support IES lights and it will have a basic animation system.
http://www.luxology.com/whatismodo/301/
Here are some of my favorite works done using Modo by other artists:
http://www.luxology.com/community/pr...alid+muharraqi
http://forums.luxology.com/discussio...9&show=captain
Give the demo a try and see it works for you.
Ernesto