Look at the Rembrandt with the adjustable tree - very well made saddle. Here's a pic of my horse with it on him:
This is the website of the lady who makes them now:
Classic Saddles or the old Rembrandt Saddles
The one in the picture, has a key, that you use to widen or narrow the saddle. Very nice! Pricey, but nice!
Then there is the Collegiate Convertible Dressage Saddle. That saddle is leather.