I'm currently using Rhino, and importing Rhinos' .3dm files into OneCNC Mill Professional. I like this arrangement due to the fact that I prefer drawing in Rhino verses OneCNC's CAD package. I then export the G-code from OneCNC to my machine controllers. I can highly recommend Rhino, as they have a great product for the money. Also, Rhino's tech support should be the benchmark for many other software companies. As for RhinoCam, it's still in its infancy and requires some more development work, but I'm keeping an eye on it.