3D world has an article on Isotrpix new 3D Compositing and Rendering software Clarisse iFX. The software runs around 3 grand, or more with a continuing license. And it is supposed to let you render and see more of an image while you work, and is a 3D rendering engine and 2D compositing engine in one.
Looks like some very cool software for 3D, and they also have a 15 day free trial. Check it out at their web site.