The top of the line Australian saddles are all REAL Australian saddles. Syd Hill is said to be an OK maker of real Australian saddles. However, you will pay a pretty penny for those, even if you can find one used.
Down Under saddles are made in India, I believe. I own two. If you watch, you can buy a new 'Down Under' line saddle for around $750, and they are a good saddle at that price. I've seen them used a couple of times around here on Craigslist for around $350...but I only see one up for sale about twice a year.
Some good info if you haven't seen it on this thread: Australian Saddle --> Pros/cons?
Also, reviews of Down Under & Australian Stock Saddle Co saddles are posted here: Trail Saddles