If you want a truely CAD program in a reasonable price range, check out Patternmaker.
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Now for some questions. Are you sure you really want CAD. I really thought that I wanted a CAD program. What I use most is the point and click part of the programs. That is the part that you tell it your measurements and pick design features, like short sleeve, notched collar, button front, etc, and let it print your pattern. I find that this is more than enough to get me what I want. I hardly ever get into the Cad part.
The programs that have point and click that I know of are Dress Shop, DS,
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Pattern Master Botique, PMB,
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Garment Designer, GD,
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I think it has 2 l's and Patternmaker PM with their mini programs called Macro's. see above
PM is full cad and you enter stuff like any cad program. Or you can start with a macro program and re design from them. This has layers like CAD and entering points by absolutes etc.
PMB, Has CAD like stuff ( it could be full cad I don't remember) I think the commands are a bit different though. It will let you alter any pattern you draft in PMB, I do not know if you can draw from scratch, but I suspect you can.
Dress Shop and Garment designer, let you change certain things from the pattern the program gives you, but some things are limited, these are great for the beginner because you really can't make mistakes, and get something too small say, but neither are true cad.
Wild Ginger and Pattern Maker, both have either extensions to the basic program or a seperate program, that let you do even more industry type stuff, like grading.
Patternmaker also has a program that runs along side PM that lets you make the macro programs which you could use to sell patterns to others. I haven't used this one. Others might have something similar.
There isalso another program called Cadterns, I don't know anything about it though, nor where to find it.
All have demos, check them out and ask other questions. I think they all have a user email list for questions, some are private to owners, some are open to all.
Sandy Erickson