What's a good 3D modelling editor, other than Blender, that can be used within Unity 3D?

Programmer Question

Unity 3D is an amazing tool for quickly creating good-looking, fun games. Unfortunately, its not intended to be used for actually designing your characters or complex levels.

Blender is the general low-budget answer for this, but is difficult to understand when compared to proprietary programs, say, 3DS Max. What else is out there?

Find the answer here