Well I can't find much about what i'm actualy looking for in detail on the internet. So I though I would ask what autoCAD would I use to make stadiums(objects base) and complicated machines. I need it to have realism and 3d tools. (not basic isometric). I know I'm asking a bit but please help! I think once I can have guesses that you suggest I can look into more what I can buy. If you have no clue what this is or what your doing posting here then DON"T DO IT! thanks!

Are you sure you are looking for a CAD program and not a 3d design program?

I'm positive.

You can do this in AutoCAD.
You can get it free with a student license and it does everything you just asked for.

As for version, whichever is the latest you have access to.