Back from the trip. Weather was great and the diving was fantastic.
Grand Cayman: two tanks with Casey and Keith at Neptune's Divers. Neptune's Reef and Mitch Miller Reef. Lots of fish and coral. Keith even took some grat digital pictures and e-mailed me so I had them when I returned (even though I don't have a clue how to use an underwater camera). I'll try to figure out how to attach them so you all can look. Casey and Keith run an absolutely first class operation. I would recommend them highly.
Majahual: Not yet a developed diving location so both good and bad. The dive was great. The reefs are virgin. The dive op is not up to modern standards, but if you want to get "off the beaten path" it is very good diving. Not up to Grand Cayman/Coz standards, but very good.
Coz: two tanks with Alison Dennis (scubawithalison.com) Palencar Caves and Cedral Reef. Alison runs a nice small operation (unfortunately, there were 8 divers this day so it was not as good as it could have been). But, nevertheless, the diving was fantastic. It's hard to have a bad dive at Cozumel. Saw sharks and turtles as well as lots of fish. The drift diving is definitely the way to go.
Both Neptune's Divers and Alison allowed diving to the limits of your computer.