A good saddle shop specializing in tack for English disiciplines would be a good place to start looking. Do you have an instructor? They should be a wealth of information.
When you get ready to purchase I would not go looking online without knowing exactly what you are looking at...as in it would have been good to have seen a saddle and sat in it once you know how to fit you and a saddle and your horse together.
If you ever find yourself in a fair fight, it's because your tactics suck. ~ Marine 1SGT J. Reifinger