I am currently riding my QH in a wide tree collegiate saddle. It fits him really good through the shoulders, but I kinda cuts low over his wither, and I am afraid its rubbing. I'm looking for something that still comes in a wide, but also has a high wither. I am in the $400-$500 range and am thinking about some of the used wintec isabells or pros on ebay. Anybody know how these fit high withered horses? Also, any thoughts on thorowgood?