Yo joerunnr,
Just back to the Montreal snow after Holiday dives in the Riviera Maya with the family. Plenty of shops in PDC. Check the locogringo (.com) site, the things-to-do/see, then scuba diving. Click on "LG Dive Shop listing" at the bottom and check for dive shops in PDC.
Not sure about the type of dives your looking for but Dragonz did a perfect job at customizing dive packages for me and my family. The owner Gonzalo personally look after all my cenote/cave dives. He is a true gentleman, well educated, extremely competent and very professional. He is a major and well known player in the local diving community - check his bio on his website. For myself (ex-pro), I was able to relax and have all the fun I should on rare vacation days. His pricing is very competitive as he operates a diving club, not a store front shop where nobody buys anything but t-shirts anyway... From my experience, I heartily recommend his services.
I am not sure about fast boats but you can contact him - he will reply and kindly refer you to other shops if he cannot accommodate you. He spoken English is far better than written but overall communications were excellent.
Enjoy your dives,