@ MissSimone, I can't remember what site, but for DW weddings (and I would think esp. those where the guests will be going out of the country), expect that between only 30 to 50% of invited guests will attend. Also, be surprise on who will and will not RSVP!!!
From watching the different forums, let me make this suggestion. If you would like a large group to attend a DW out of the country, make sure that you have a large bridal party, ie, bridemaids, groommen, flower girls, etc.
For my daughter's wedding to Negril, we invited 100, and have 42 confirmed with about 10(!) still thinking about coming, though the RSVP deadline date has past. We are only have one MOH and BM and the bride wanted something intimate, so we're good.
Good planning, and don't allow others to stress you regarding your wedding - complaints about price, location, comes with being a destination bride.