I ended up going with Jeff Stone of Azimuth Marine. I could not recommend him more highly--very thorough and knowledgeable. The boat was not really prepared for a proper survey because the owners had not cleared out all their "stuff" so access to necessary systems was slow, to say the least. But, he made sure he got access and got it done
He was very willing to call me over to explain something notable, or call me aside, away from the owner and broker and discuss something not so good. He uses a thermal imaging camera to look for wetness everywhere as well as a meter and a hammer. The guy knows his stuff and I would use him again in a heartbeat