Like most all other hunts, longtime established outfitters that consistently take large trophies will cost more that newer outfits.
You might want to subscribe to FNAWS (Foundation for North American Wild Sheep)order some back issues, and look at the guys that consistentley take good rams.
Go to the anual conventions and get a good feel for an outfitter that has what you are looking for.
You are getting ready to invest a LOT of money in this project.
Take your time and do it right.
Make it the hunt of a lifetime!
Good Luck.
HH