there are many type of cad/cam out there. Dolphin is a good package from what I hear for the price. You really need to decide on what type pakeage you need. Are you looking for just 2d or 3d. are you looking to do art type files. Do you need a full blow cad system for doing solids ect.
There are big price changes with the feature you either want or need.
I will say that I would not buy Bobcad V22 at this time. The system is still unstable and buggie. But I will say the V21 is a very good version for the money. You can do 3d and solid cad work. I have seen it sell for as little as $300/USD