Just a note for those with spinners...an Aussie-saddle is pretty near designed to help keep you on in a spin. The poleys slam into your thighs and force your hips to stay aligned with the horse. I bought one because I was hurt while riding - OK, when the riding stopped - and could barely sit in a saddle. About a week later, little Lilly spooked at a dove, did a 180, jumped a couple of lengths and then did another 180. I was caught totally by surprise. I ended up with a big, mickey-mouse shaped bruise on my left thigh...but I was still in the saddle.
Just a thought. I understand different preferences, and have been playing around with using an Abetta western saddle on Mia lately, after a month of riding her in an English saddle. But for just staying on a horse who spins, an Australian style saddle is hard to beat. Yeah, it is cheating...so sue me!