I also love county saddles [i have one ordered !] but they are EXPENSIVE. The only reason I can afford one is that I hoard my money like crazy [besides board/vet/farrier bills lol] and I sold a horse in october.
Have you looked at Thorowgoods? The high wither ones fit TBs like a glove. They are wool flocked, adjustable knee rolls, deep seat and semi-leather. I think the seat and flaps are leather and the rest is faux. I have the synthetic T4 version and the balance is great in that thing. It really frees up my horse's back and shoulders too. There's a store in Vermont that sell them in the states for about $900.