Here as well. It took me many many months to even find a Border Collie for adoption anywhere. I'm not sure where you are at, but there just aren't as many. And ACD are just as impossible to find. You can find mixes, but no more than maybe a 25% mix. Mostly labs, goldens and pit bulls are in the shelters here.
I've worked with a lot of ACD's, mostly ones at boarding kennels. They are happy dogs, friendly, and they do well with other dogs. At least the ones I've seen. Border collies here are practically nil. I've met ones at the kennel, but very very rarely in shelters. Most of the ones I've seen are being given up via Craigslist because they are having a baby, or moving, and don't want to deal with the dog. All the Border Collies I've met have been friends, or dogs at the kennel. They have all been superb dogs.
Also, I too would like to know how many Border Collies you've worked with Smexy...