What can be even more important is your choice of CAM software, the thing that takes the output of your CAD package and turns it into gcode cutting instructions for your machine. A lot depends on what you want to cut on your machine, whether it's simple geometric shapes or highly complex cuts. As far as CAD is concerned, it's what you want to draw more than the CNC aspect that matters and if TurboCAD works for you, that's great. I use it, but I'm finding it really lacking when it comes to 3D drawing. CAM is a different matter and can really affect these ability to move from design to cutting.