I am interested in buying a new Render with an animation feature. What is best for Rhino?
the new rhino render is cycles based, so we have a great built in rendering solution already in v6. It will just continue to get better in v7 and beyond.
for animation the only Mcneel based solution is Bongo which is a plugin and purchased separately but very reasonably priced.
Keyshot has some limited animation capabilities in the pro version, but is quite expensive.
Blender has animation and rendering capabilities and is free, but would require you learning a whole new package.