Check out mantaraya divers. Fernando has everything you have asked for. I only dive with mantaraya when I visit Cozumel. www.mantaraya.com
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As a side question from this thread...
We are probably going to Playa del Carmen for our family trip this year. Its a family vacation so I can probably only pull off once, but what would a schedule look like if I take the ferry over for day?
What time would I have to get the ferry in the morning? When would I get back?
A larger consideration over Nx cost difference IMHO is whether or not the op has an analyzer on every boat for you to use or for the DM to use while you witness the FO2 reading.