Hi Woods Witch,
My only beef is that I don't like electric fences, period. While they may contain your dogs, they can't keep other dogs, critters and people out of your yard. And, if a dog charges thru that fence once, if they have high enough prey drive (think DS

), they often learn that they're willing to do the time to do the crime.
I realize I am in the minority when it comes to dog owners-at-large, but I'm one of those who doesn't believe in unsupervised dogs in the yard. If my DS is out in the 1/2 acre fenced yard, them I'm with her.
However, you wanted a dog that wants to be with you, right? My Geyser has zero interest in hanging in the yard if I'm not out there with her. She's an only dog, tho, and that might be different if she had a couple of doggie roommates to hang outside with.
Also, while most DS are very protective, they're more of a deterrent than actual protectors, in the sense that you couldn't count on one to necessarily attack someone on your behalf. Even dogs that have strong protection sport backgrounds can't be counted on to actually attack people when it comes to a real life deal. That's not a problem, tho, as most people take one look at a DS (or similar kind of breed), and decide you don't look like such an easy mark. And, you can teach your dog to bark nasty on cue, in the event that you think you'd like to warn someone off.
They will bark like mad if someone approaches your property, and most likely, your vehicle when you're out in the world, or if someone comes up to your house. That's a great deterrent.