The San Carlos Indian reservation Here in AZ produces some huge bears. Other units in AZ do as well. Several states are producers as well. New Mexico Im told by friends is a good choice.
I have never used a guide here but there are many that post their sites on the web and visit hunting sites. The 2 bears I have from here came from unit 27 and 29. Unit 27 produces some big bears as well.
More knowledgable folks would be more of a use than I on this I imagine.
Coues