Hi Lejan,

""""""""""""""""""It seems this Rhino plug-in does a really good job in creating a NURBS model based on
polygon meshes.""""""""""

Be sure you are looking at the "standalone" version.. They dont need Rhino and are a bit cheaper.
Here is a link to the open mesh one to try:

http://www.resurf3d.com/mesh2snurbs.htm

This one works on obj closed forms:

http://www.resurf3d.com/Objmesh2solid.htm

But it will be more of a "fitting" than a re-creation... I didnt put enough time into the obj one to really be able to speak to it's output.. Maybe you can make the demo work well and report back!