I hauled my horse 350 miles yesterday looking for a saddle that fit him. Found one, too. I, too, have a high withered horse. He's also pretty good size at 1450# and 16.3 hh. I considered ordering a saddle from the 'net--but figured it was worth it to haul him around and actually put the saddles on him before I bought one.
I looked on CraigsList and Tack Trader for used saddles. I ended up with a good fitting saddle for half the price on the sticker (which is still on the saddle). It's slightly and lightly used. It was a very good deal and beat the prices I could have gotten on a new saddle on the 'net--even a cheap saddle on the 'net.
It cost me a full day of driving around pulling a horse trailer, a tank of fuel, and dinner out for me, my wife, and son. And was worth every bit of it.
Oh, yeah, I also had to pay for the saddle.