Sculptris needs "moulds" and "stencils"
One thing that bothers me about sculpting tools is that you can't just "stamp" or have "moulds". Stencils/moulds would be great for more common operations and/or making templates for pieces.
For instance I've been tooling around trying to create a ship variaton of the Super Nintendo game image below.
I also find it difficult to create sharp edges, I can get organic looking forms pretty easy with regular brush but 'sharp' regular obejcts (squares, triangular edges) remain elusive.
Go Get Wings3D ..... Use this to build your base-geometry, then import into Sculptris (detail slider 0) and subdivide to sculpt .. much more similar to Zbrush....
Here, watch some of These