I was married in Playa in May of 2007 and did not go through a resort because I found there to be too many restrictions. I was recommended the company Ajua Weddings, Destination Weddings and Wedding Planning Services in Playa del Carmen, by a friend who went to a wedding in PDC that was organized by them. It was great and I have no regrets and my planner Maartje was awesome. Everything was so easy. I used another agency for some additional planning for my guests and transportation to beach location to keep my costs down, Playa del Carmen & Tulum Hotels, Condos, Tours & Tips, Riviera Maya Mexico.
I would check out both of these and email them for quotes before settling. I was able to do everything for my wedding, including rehearsal dinner, and a welcome cocktail reception for all 50 guests for under 15k.
Happy planning! It will be beautiful!!!