I really appreciate your answers.
It turns out that vue's student version has a very ugly watermark. 3d max has some ugly limitations too. I haven't checked maya yet. and there is no student version for combustion. The big problem with student versions is that in most of them you can't save a file and then use it in a full version. In other words I'd had to do everything in the student version or vice versa.
Still, yesterday I was talking with my 3d profesor about this, and he said that there should be no problem as long as I do some of my work at college and if I put the name of my university in the credits. I would stay in the legal area this way because I'd be part of the university which owns the programs. In the end I'd be using original licenced versions, but I would give myself the posibility to do some work at home. I don't think Autodesk or E-on software looses anything from this, because it would be no gain for them that I sleep in college (cause that would be the only way for me at this point). I'm not gonna do that sacrifice just so someone's rules are played correctly even if nobody benefits from them. I think rules are only good if they are reasonable and do good. In this case, they would only stop a man from doing an free artistic proyect.
Anyway, I suppose that saying all this is ilegal. So don't buy it, I was just joking. Honestly.
About using milkshape 3d or Blender... I tried them, and honestly, after you know maya or max it's a little depressing to use them. Not that they are not great, but maya and max are perfect, and something that takes 30 minutes to do in blender, I do it in 10 minutes in Maya, and probably prettier. But even if I got the hang of blender, still maya can do more stuff, and I've been using it for 3 years, so I just can't throw away all my expertise in maya away and feel that I learned all that for nothing. I really prefer to work at college overnight instead of not using maya.
So that's what I'm gonna do; I'll do all the work I can at collage, and if I have to bring something home, I'll do it.
But I am joking, obviously.
Officialy, I'll do everything at college. I swear.