Elaeagnus - greyish foliage. Relatively fast grower. Will get to 20 ft, can be shaped and held to a lower height.

Viburnum odoratissimum is the fastest growing screen I have used. It does well in part shade, is dense has few pest problems(white fly from hackberries in the late summer)and grows to 25'H. It can also be pruned to maintain its form and space in the landscape.

I have used wax myrtle for just such a screening. Fast growing,good form, can be pruned and best of all a native plant with little maintenance.