We always recommend a home inspection (General, Pest, Radon, etc.).
In the State of Ohio you don't have to be licensed to do an inspection (Not sure what it's like in other states). So... anyone can walk off the street and claim their a "home inspector."
We have a list of home inspectors we give to clients that are ASHI Certified. You can look up home inspectors in any state at their site www.ASHI.org.
They have to classes and continue to take classes to be a member.
Kirk, we always recommend at least three inspectors to cover our butts incase the home inspector misses something and the buyer comes back to us saying it's our fault because he's the only one we referred.