GKDantas,
In that you are right :) I've heard a lot of good things about Moi, but I use Amapi for my nurbs stuff. You could also use Rhino, but it is a bit more expensive.
entera_voss,
Just remember that eventually, you'll have a mixed-app workflow, so don't get TOO married to an app, it can be counter productive in the long run.
Just my two cents.
If you are just for the hobby part, look into Houdini by SideFX. IMHO it is the most complete 3d app out there, and there is a learning edition which is free, and a "starving artist" edition which goes for $100 US (just not for commercial work). The complete edition is even more expensive than Maya, 3dsmax, or Softimage, though...

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