I can recommend the RE Touring screen from Hitchcock's. Not too difficult to assemble, but quite a lot of parts and a set of miniaturized instructions which will require you to have a magnifying glass. I had to use both my reading glasses and the magnifying glass!
Just getting all the bits in the right places and facing the right way takes time. You'll read that in the microscopic instruction sheet. That's what took up most of the 4 hours it took me. It is a solid mount to the fork tubes though and better than a handlebar mounted screen.
It deflects the wind from most of my torso very well, but I feel the breeze (no buffeting) on the arms of my mesh jacket. Keeps the pits cool! The back pressure vent in the screen is a nice touch too, as it relieves the back pressure, which creates turbulence, from the wind flowing over the top. I get no helmet buffeting, but I do feel a pleasant breeze with my 3/4 helmet.
I think it's a very happy medium between the total wind blast with no screen, to the protection from the fairing my other bike has, which puts me entirely in still air at speed, from head to toe.