I think that privacy hedging is a fantastic guys. I was actually searching for information on fences, but you idea is much better. My yard could also use some landscaping features. Hedges would solve both of these problems.
Here is an interesting quote for you...Come sale time, a green property typically appraises for 10% to 15% higher than comparable conventional homes according to Jim Amorin, vice president for the Appraisal Institute, a professional trade organization. (Smart Money, January 2008) So, obviously some appraisers do feel that there is an increased value for a green home like the one you have built but it many not have been considered by the appraiser that reviewed your home.
Take a look at this link...http://www.natresnet.org/ratings/overview/resources/appraisal/APJ_99_10.pdf and see if it can give you any guidance or at least help you decide if you should get another opinion.... more