Just a point, long stretches in rough country can work very well with electric if done right. Use 1 wire, unless along a major highway I suppose, but keep it loose. Why does it have to be fiddle string tight? As long as it is taut enough to stay out of the grass, it's good enough. That way when the wildlife hits it, it springs with them instead of snapping. Same for temp fluctuations or snow drifting. I've seen folks string it from tree to tree through brush country, using a big enough energizer and not too tight, works great.
Thousands of miles of it are used in Aus/NZ in rough country too. Can't be all bad. As for the cattle needing to be trained to it, is that their fault, or management? :wink: