Best CAD software for me?

I am looking for a new CAD program that will cover my CAE (computer-aided engineering) needs. It needs to be powerful. I want to be able to design simple designs like cubes or complex designs like full blown space shuttles. I want to be able to do mechanical and organic designs both with few headaches. And I need this software to also be CAM software so I can have parts milled on a CNC machine and whatnot. Now, with all that in mind, which CAD/CAM software is right for me? thank you very much!