I also like Cinema4D. It's very powerful, has excellent render quality and good render speed, and a very flexible nondestructive interface that leads to efficient workflow. It does not, however, have NURBS modeleing, which I still prefer for product design applications. formZ is powerful but has one of the worst interfaces I've ever used, and I won't use it for that reason alone. You might like it if you use AutoCAD though.
Lightwave. By far the best program out there, imho. The rendering is about as good as it gets. Downsides: It's expensive, and has one heck of a learning curve but then again, most 3D programs do. s.n.goat
well i used to be a graphics deisgner, and i used Photoshop 7, Photoshop CS, and then i satrting in 3D, i highley suggest that you get Cinema 3D, its got to be the best app out there for this kind of stuff, im speaking frome xpirience
Lightwave has a separate app just for modeling and its probably one of the best out there. Once you're finished modeling, you send it or load it to the Lightwave app (used for animation and rendering).
FormZ is way too much of a pain to learn. I've used it and I always find it easier to do things in Lightwave.