ALLSTAR,
Sorry about your Cancun trip. We were in Cancun 2012 also. I would have picked Cozumel but. my wife won a vacation to Cancun so I sucked it up and went anyway ;-) .
I booked with Scorpio Divers in Cancun for a trip to Cozumel. They picked me up at the hotel, drive me to Plya and put me with Dive Ballam who took the boat right to dive Cozumel. The trip was worth the trouble. We dove The Devil’s Throat and Cedral. Should you get back to Mexico do Cozumel