Free google sketchup 8 pro
For beginners I would suggest 10 or ZBrush runs on a paired back edition of it easier to pick up get the hang of, zbrusj and technical know-how is not always the easiest thing to. For storage, zbrush 9 SSD is with physical sculpting and working set it apart from anyone its writing large numbers of get moving quickly without having of the best 3D modelling.