Hooked4Life:We used Dennis at Diablo Divers last August in PDC. You can see some pics (not the best but you get the idea) on my web site. Dennis was a great dive master and we had a great cenotes dive experience. I would highly recommend him.
I also use Dennis for a cenote guide. He's been our favorite out of guides we've used. Yucatech came highly recommended to me for training. I'm deciding between Yucatech or Dennis and whether I want to just to a cavern cert or intro to cave.
Decisions, decisions.