3D CAD 3D CAD is a natural progression from 2D
Here are some options with lowest cost first.
Most are surprised to learn that most 2D CAD software will do 3D. Though 3D it's wire frame with no solids or surfaces. 3D wireframe can be used for working out awkward angles for example. Even co-ordinates along a curve drawn in 3D wire frame, can be ID'd.
The next step is basic 3D. This will have true 3D solids and surfaces to which materials can be attached. Then using the built in basic render, a picture of an object can be created. You should be aware however that there are more sophisticated rendering software packages available, which produce photo realistic results.
After that the market tends to be split between mechanical and architectural 3D with BIM.
This is where On-Site-Support (CAD) will refer an enquiry to associated company's who can provide the expertise required.
For mechanical it's http://www.smart-dm.co.uk/
For architectural it's Autodesk's Revit BIM product