If you have never been to Jamaica, it is amazingly beautiful!
I have a few things you may want to consider:
I have been to the Palladium, it is beautiful, well kept and very high class. If you are looking for a quite relaxing and intimate wedding week, this is the place for you. We saw wedings at the Spa (Elegant) and Beach (Fun). The two receptions were very different, and I'm not sure of the costs. One was on the volley ball sand, they set up seet walls with lights on them to make it more private, and the other was on the beach with a band and a bon fire.
We were considering this resort, but we wanted as many of friends and family to come at the price is a little higher than the other options. I may be kicking myself for this decision in January, 86 ppl coming....so far!
Our travel agent advised against the RUI because of unsatisfied customers, and one of the major tour providers in Canada recently dumped them from their roster for this reason. I have never stayed at any RUIs, and a friend liked the one in Ocho Rios when she went there in 2009.
Hope that helps a little.