I just went through a search for a new endo due to moving. I did a Google search using "endocrinologist" and my zip code. I live in an urban environment so I have a fair amount of choice.
I think the biggest thing you need to consider is what you want and your priorities. High on my list is an office staff willing to work through all the obstacles that a pharmacy benefit manager will dish out. I want a doctor willing to write Rx's "off-label" if I can make a good case for it. A good endo, to me, is one that respects the knowledge I have and sees me as the senior partner in the relationship. I want a good listener.
I realize all these things are hard to find in any one provider and I'm more than willing to compromise. I seek no advice on how to dose insulin. I don't need it and don't want it. It's a waste of my time.
The best way to find a good doctor is word of mouth. You might consider participating in a monthly diabetes support group and raising this discussion with the group.