We rotationally graze our goats using Premier 1 electronet (poultry kind) for the does/kids, and a cattle panel setup for the bucks. If the area you are trying to graze is very brushy, you'd probably go crazy with the electronet (it would get tangled on everything, and you may not be able to get a good charge). A cattle panel setup would probably work pretty well though if the ground is somewhat level, or if there is a tree you can secure one side to. Ours is just 4 cattle panels (16ft x 52") hooked together into a square.. well more of a circle really as they are bent in the middle for better stability and to increase the area of the pen. We use three snap clips per side to hook them together, like what you'd find on the end of a horse lead but without the rope. We do attach one side to a permanent fence, so the buck's pen basically travels around the edge of a large horse pasture fenced by woven wire. I haven't tried the pen free standing, but this blog shows some neat support braces to make it that way. Seems to work for them even with nubians!
http://www.culturedhome.com/2010/05/18/rotational-mob-grazing-elimintes-buttercup/
