Well, lets see. The guy should have a Thompson table, should be proficient at Intersegmental traction, and know how to correct the upper cervical spine - C1&2.
No lumbar rolls or cracking the neck just to hear it crack.
There are many different ways to correct mechanical problems. The best way to choose a good chiro is to ask around. See who everyone else is going to.
Sorry for the delay getting this back to you.