well are looking to hunt in AZ or MX?
MX will be a little more expensive but odds of getting a buck over 100" is a lot better.
There are a lot of outfitters out there who would love your business. One of the most important things to remember is that most of the bucks taken in MX are < 100". Of course you do not hear about these deer, all you hear about are the 120" bucks that are taken. do not set yourself up for a disappointment.
I would try to find out from potential outfitters what their avg buck size harvested is. something else that is important is how many years they have hunted the ranch you will be hunting on. being on a new ranch is a gamble. old saying of you get what you pay for generally holds true.
send me a pm and I will share with you some other info I have on MX outfitters.