My suggestion is to ride one before you by it.  My dad purchased one and I cannot ride it and get comfortable at any time.  It has alot of padding in the seat, but it hard for me to ride.  He has a 15.2 TWH and it fits the horse just fine.  There is a place in TN that will let you bring your horse to the store and try out the saddle before you purchase it.  That is my suggestion.

I have a 21 year-old TN Walker.  She is 15.3 hands.  I have a Tucker saddle & also a Tex Tan saddle.  I would suggest that if you decide to get a Tucker see if you can find a good used one.  To buy a brand new one will set you back a few dollars.  Don't get me wrong, my Tucker is a nice saddle & is comfortable, but I probably ride my Tex Tan just as much if not more than my Tucker.  If you can find some nice used saddles, you might be able to save enough money & get 2 saddles for the price of what one brand new one costs.  Just something to think about while you are looking. 

I have the Tucker Sierra Endurance saddle: http://www.tuckersaddles.com/endurance1.shtml 

I have the Tex Tan Kotula saddle: http://textan.com/57.shtml. 

Hope this helps some.  Good luck & hope you find saddles that fit you & your horses.