Just my thoughts on the Rhino vs Moi thing.

I bought Rhino while I was a student for a very good price (they let you use it commercially too which is very nice of them). I tried to learn it however and always ended up feeling frustrated, it was just too different from everything I learned up to that point.

Fast forward about 3 years and I start to realize most of my personal work (mechanical modeling, ships, cars, bikes, planes) is much better suited to nurbs than SubD modeling (I can make SubD's do what I want and need, but it is painful sometimes) so I dig out my copy of Rhino and give it a whirl. Same old frustrations. Fast forward another 6 months and I discover Moi and for the first time nurbs just kind of click. I'm totally hooked now. :)