Darlene, I had a similar problem and I invited everyone, but as it got closer, so many people started himming and hawing about the money and getting time off. I am sure you will have a little less than you expect. I would still invite everyone so you don't offend anyone and see if your resort/videographer can do a web stream for those who cannot make it, or just send out a video when you get back.
Begin calling the resorts you are looking into to book a block of rooms, you would hate for someone not be able to come because everything was booked, I would work with Tammy (host) on that.
Let us know if there is anything else we can do...
ps. Glenda, wow you are really rockin' this forum, for someone who claims to not be into the wedding details ) I hope all this time on the forum is helping you to make some decisions about your wedding!!!