Thanks everyone,
I will be investigating the intellicad options and I will likely have many more questions along the way.
The BIMS technology sounds like something you could hardly do without. It is , in fact, the way I imagine drafting with a cad program. ie: defining wall thickness and drawing walls, not lines, and adding doors, windows, etc from a menu. And, then projecting that drawing(s) into an elevation.
I will report back after some research. In the mean time, if anyone has any suggestions that would aid my search - I'll be back here to check them out.
Thomas