I have shepherds, not aussies, but I can tell you what I require. I sell all pups on limited registration and will only lift it after two years of age if the dog has passed a minimum of hip and elbow clearances, is MDR1 N/N, and been titled in something other than CGC (conformation, herding, agility, obedience, etc...). I also reserve the right to refuse lifting the limited registration if I do not feel the dog is breeding quality due to structure, temperament, or health. If the dog is bred before this is done, I will never lift the limited. This isn't an uncommon thing for breeders but each has his/her own way. You'll just have to contact the breeders you are interested in and see what exactly they require of you. Odds are they will want you to stay in close contact with them and show you are serious about bettering the dogs or they'll refuse to allow you full breeding rights.
I believe you've done your research but please remember that there is ALWAYS something new coming out so never stop studying. If possible, please also participate in the research studies your dogs are qualified for. Most only require a cheek swab or blood sample so you're not hurting your dog and the genetic studies can someday save hundreds of dogs by finding genetic markers or even cures for various diseases. AKC's website has information on current studies going on, the breeds wanted, and the requirements for dogs participating. It's certainly not all the studies currently being done but it at least lets you see what is asked for in these studies.
UPDATE - Jen, yes I do know that. For conformation, I actually show in UKC. I prefer the structure of GSD shown there. They don't have the extreme angulation and roached backs that many of the AKC showline shepherds do. That structure just isn't very effective when you take the dogs out herding IME and I much prefer dogs that can work. It's also REQUIRED that the dog's be owner handled. No pros allowed unless they own or bred the dog. If someone completes their UKC championship and at least gets prelims on the dog, I have no problem lifting limited to let them show in AKC. If they wanted to do it from the start, I'd allow it only if I stayed on as co-owner until the dog was h/e certified, MDR1 tested (if not CBP), and had completed its title.