Simply the best
Rhino is incredible. I use it for jewelry and it has increased what I am able to do significantly. For non-engineer types there is a bit of a learning curve, but instead of getting some of the "dumbed down" products that are now showing up, I feel a beginner would do much better to get Rhino, understanding that they will grow into the product. Nothing would be more frustrating than getting a "simpler" product and finding that it isn't capable of doing what you need it to do. This will not happen with Rhino.
Rhino IV is also a wonderful upgrade. Lots of new features to speed work.