Thanks, that is REALLY helpful. I'm mostly an english rider, and I'm transitioning from eventing to trail riding. I loooooove my Kieffer english, but it's just not a saddle I want to spend all day in going up and down mountains. I'm actually looking for two new saddles, one for my mare and one for my gelding. The mare is a stocky QH and the gelding is a narrow STB. The mare fits in almost any western saddle, but the gelding is tricky.
Quality is REALLY important (I'm used to riding in a $3000 Kieffer) but at the same time I don't want to spend a huge amount because the gelding is only 3 and might a) roll on it and/or destroy it, or b) grow out of it. I also like to stay on the english side of things - close contact, and I prefer english style girthing.
Also, I am not really sure about seat sizing. I have looked around, and I keep seeing different conversions. I ride in a 17" english saddle, what size should I be looking at for Aussie saddle?