If you are going to plant any type of arb you are looking at ~70 plants and if you do everything yourself and plant 3'-4' specimens you are looking at no less then $2000.00. If I were in your shoes I would plant ##### willow. They grow really, grow to about 12' tall, grow fast and can be cut to the ground every few years to "reguvenate" their size and shape. Not sure if they will grow out there but I am sure there is some type of shrub type willow that will. To plant them all you need are cuttings dipped in some type of rooting compound, although they so root naturally. To ensure good root formation, no matter what you plant, I would have someone rototill the ground before you plant.