Good luck Sako and don't shoot the 1st decent buck you see, outfitters are well known for filling tags on 12 inch bucks. make sure they know you want a mature buck.
Trophies can come out of any area in Wyoming, not just the high PP areas.
I hunted with that same outfitter, first time out our guide wouldn't let us shoot a 12 inch one, said if we insist later we can find them all over the place :-)