Do you want a render or just in the viewport?
For the first one, you'll want to have two different shaders, one with contours on and one off. Or just composite that after.
For the viewport, I don't know that there is a way to use wireframe on shaded to certain objects. Depending on what you want, you could just select one of them. Or you could composite a screenshot. Or you could copy your modelling panel (Panel > Tear off copy) and have one with wireframe on shaded and one without. Not sure exactly what you want but hopefully one of those solutions will work for you.