I would not full-heartedly recommend Fusion 360, but as of now I found it the best I could find (admittedly not having looked too much around). It has a steep learning curve, and is very unintuitive to me in many regards, but the power it has is remarkable. With some tutorials and a few evenings of fumbling around I finally mastered it to that degree that I created models with it successfully and milled with SM2. I wrote down my starting points here: Learning to mill: Random chinese dragon bas relief