FormZ 8 is my favorite architectural modeler
FormZ 8 is hands-down my favorite 3d modeling program for architectural design. It offers much more than other tools out there and has an easy-to-use interface so I can get my work done. It has many parametric tools like walls and stairs, and also has NURBS and new subdivision surfaces for parametric curvy surfaces. Layout is a bonus being able to take live views of my models and make drawings out of them. It also has tight integration with Maxwell Render which runs as a plugin right inside it.
I couldn't do my job without it.