What are you looking to build/make? If you want professional architecture Autodesk Revit is the best for this. If you want quick and dirty modeling, even for

What are you looking to build/make? If you want professional architecture Autodesk Revit is the best for this. If you want quick and dirty modeling, even for products, use google sketchup! There are a lot of product designs that have been done in sketchup.