Hello Invidia

I've been using Rhino for about three years now. It is probably more free-form than some of the other (poly) based systems (never looked at blender I confess) . Everything is based on curves - you can just steam in and start making surfaces and joining them into complex shapes. The other packages I've used tend to rely on constructing polygon meshes and using sub-division to create a smooth model.
I've used Lightwave a fair bit (still do) and it requires much more planning (maybe that's a good thing?). C4D is also quite process driven - (I tried it briefly )  and most of the high end systems are poly based with rhino style nurbs bunged in afterwards. Also look at Zbrush - it's cheap, uses a painting metaphor and produces amazing results. But you'll need a chunky machine to use it happily.

And here's the rub - If my experience is anything to go by it's going to take you 12 to 18 months to feel you are in control of what's happening to your model. Unless of course you can spend 8 hours a day using the software! Hope this doesn't sound negative but I found shifting up from 2d to 3d very time consuming and frustrating.
But you'll get there if you want to do it. Rhino is completely terrific and worth the dedication if you have the time. But also think about getting access to a good renderer. Flamingo is a bit limiting.

And just when you think you've mastered Rhino you import a model into poser, look at the results and then go down the pub and drink 14 pints of guiness. The nurbs to mesh journey can be painful, but once you get it to work, it works.  Hope this is some help and good luck.

ps - And if some of this is confusing I apologise. Post again to this thread and I'll do my best to explain the concepts if that would help.