ANNASCHABEN-
Yes, you're absolutely right, but this didn't come up necc. during this thread. When I'm able to I'll start a new one regarding the options out there and the regulations of entry for each. I think people in our breed-and others-should be more aware of the competitions available to them.
If you have a dog that "looks" purebred according to the AKC, you can take photos and fill out some easy paper work and submit it to the AKC for what's called an ILP number. Your dog must be neutered if not registered in order to obtain an ILP number and once that's done, you are allowed to compete in Non-Conformation sports within the AKC.
I'd do it w/ your Aussie if it's something that you're interested it.