Well, my fiance and I chose Dreams Palm Beach in Punta Cana. Our wedding is on November 23, 2010. I'm not sure how much help this will be, but this is what made us choose DPB (dreams palm beach) instead of the other Dreams resorts.
Punta Cana apparently has the most beautiful beaches in the Dominican. So that narrowed it down to either Dreams or Dreams Palm Beach in Punta Cana. Dreams Palm Beach is newly renovated, and the rooms/restaurants look stunning! The rooms as Dreams Punta Cana aren't as modern (although the swim up rooms sound amazing). The wedding packages, as far as I can tell, are the same no matter which resort you choose.
When my fiance and I were going to wedding shows and talking to travel agents (especially those who specialize in destination weddings), they all said that Melani, the wedding coordinator at Dreams Palm Beach was amazing, and made your wedding day stress free. The wedding coordinator at Dreams Punta Cana wasn't thought of so highly, and everyone said Dreams Palm Beach is a much better choice.
We've been talking to Melani for months now, and she always responds super fast, and answers any questions we've had (no matter how stupid). She has been a tremendous help!
So... hope that helps a little!
Vanessa