RE: INTRO CAD PROGRAM TO DESIGN JET PART'S?
Hey Mr. Good life! LOL
You are talking solid modeling to do that kind of part, as most of it is done on 3D CNC machines. Soild Works, Solid Edge and AutoCAD Inventor are a few, the entry level is in the several thousands of dollars though. There are many 2D drafting programs if you just need the 6-view to define the part, but the file your local machine shop CNC guy would want comes only from 3D files.
A better like is one of satisfaction!