Look into the Kuda brand https://www.kudastore.com/store/
I like their trail saddles and you might find one used for your price range. They're well made, not overly heavy but very comfortable.
I've ridden in the Master and Gold cup on pasos and for me, it felt awkward. I hated the high pomel area..not for me. I think I had the Protrainer..it's been a bit and I sold it. I grew up riding bareback and I still don't like a saddle, but found that one really comfortable. The rigging is a little different but hold the saddle firmly in place.
The Aussie saddles are pretty nice, too. I had the Wizard Poley Australian Saddles - the Down Under Collection of Aussie Saddles for Trail, Ranch, and Endurance riding
and while it was comfy, it was heavy. At least for me. I'm short and have some shoulder issues so it was tuff for me to hoist the saddle. Again, look for them used and the 15" should fit you fine. I was about 105# at the time and I like room in the saddle..a good fit.