your best bet is to find a saddler who will come out and help you find the best fit for you and the horse. :)
I agree completely. Your best bet would be to hire a Professional Saddle Maker/Fitter to come out and help you out with your process of saddle searching.
A good one should come out to your place, not only with their tools/equipment to measure and assess your horses back, shoulders, etc, etc - but also with a truck/van full of saddles to try on your horse.
The saddler should watch you ride as well, to see how your fit in the saddle, how the saddle works for you, how your horse moves/works with the saddle on and how you work in the saddle.
A good one will cost between $75 - $100+.
I greatly dislike the tree's of wintecs. They are far too strait, especially for TB's backs with high withers. I used to have a Wintec 500 A/P, and my horse would show pain in his back, without my knowledge that the tree was too strait for his arched/shaped back. The strait tree, was bridging - I got rid of it. Thank goodness. But I wouldn't of found that out, without a Saddler helping me.
All the best!