Put your house up for sale, and move on. Its not worth the aggravation. Its one thing to have one crappy neighbor, but to be completely surrounded?... its time to move on. I wouldnt do anything to retaliate, its not the right way. Kharma has a way of working things out in life, and its far better to take the high road and be able to sleep at night with a clear concscience vs feeling bad something happened due to getting even. Nah.. As much as its a pain in the butt to move, moving on may be the simplest solution.