If you are a student you can get the Autodesk tools like 3ds Max or Maya for free at students.autodesk.com. Commercial use is not allowed but if you just want to learn using the tools this might be a good option for you.
Get 'em addicted young ;)
When I do 3D artwork, I use blender but the biggest issue with it is that it changes a little bit too quickly compared to commercial offerings.
Does anyone remember this (not too old) interface?
http://b.vimeocdn.com/ts/719/271/71927121_640.jpg
Was replaced with the current one.
http://upload.wikimedia.org/wikipedia/commons/6/6d/Blender_Version_2.570.jpg
Potentially to be replaced again with
http://www.blendernation.com/2013/10/17/new-blender-ui-proposal/
Blender is open-source... but like many open-source projects (i.e Gnome 3) drags in far too many dependencies for a single person to maintain, so it is almost impossible to keep running the version of Blender / interface you like. Though the older interface was a little bit more ugly, it seemed less claustrophobic on smaller laptop screens.