I have to say that I would go for the regular fencing too. I think $200 Canadian is a bit low to install the invisible fencing on 23 acres too. Maybe its because you plan to do your own labor. But, I have talked with those who use this product successfully. Every one of them had to work on a consistent basis for quite a while to train their dog what to do when they hit the "shock" zone. And that is to turn back into the yard. Of course to teach this, you have to shock them, and I hate the though of that. Have you thought of fencing a smaller portion of your acreage instead? I would definitely consider above ground fencing, although even that doesn't work for everyone.
Good luck, what ever you decide.
Logan