Yay! I'm glad your search is going well. I love the Jalisco because of the greenery and the gazebo is GORGEOUS!
I am not sure who the wedding coordinators will be once we get to the resort. I went on to the RIU.com website and submitted a "Check Wedding availability" to see if my date was available. Within 2 days I got a response from their Cancun/Vallarta wedding coordinator, Tristan Chacón. I have e-mailed her several times over the last week and she is very professional and quick to reply with all of my questions.
The latest news is that they are NOT booking weddings for the new resort, RIU Palace Pacifico, because the resort isn't even open yet! They will start booking weddings there next year. The resort photographer is still Aldo Tovar. She also e-mailed me a price list of additional services beyond the wedding package (DJ services, etc). It is pretty reasonable! I will see if I can post that on here!
Let me know if you have any other questions! How exciting would it be to be down there at the same time!!