We narrowed it down to two resorts and then used the more reasonably priced resort for the wedding and the more luxurious resort for our honeymoon. That decision worked out perfectly for us, because our DW resort had lost of activities, entertainment, etc as opposed to our honeymoon resort, which was more of a luxury resort with less nightlife. We knew our guests were going to be a majority of parties, so we took that into account.
You may want to make a list of pros and cons for each resort for a)your desires, your MUST-HAVES, c) pricing, d)what you envision your guests enjoying most about each resort, etc etc etc and see where the hammer falls.
I know it's a tough decision!