I would NOT recommend Amorphium -- EI has really stopped supporting it. I seem to recall Tiger broke it -- It won't run properly on newer Macs (something in the way Tiger renders the interface didn't agree with Amorphium, and EI still hasn't fixed it.)
I moved to Cinema 4D after giving up on Amorphium, and I have found it to be an excellent program overall. It's not the least expensive 3D program out there (I want to say around $695) but it's very user-friendly and can put together some amazing graphics. Plus, it can export to Flash.
Thanks folks, all great suggestions. There's a conference for Cinema 4 coming up at my local college so I signed up to attend it. But gee they're all very expensive software.