Thanks everyone. After much discussion at home I think we are going to go with Greenberg. They have one for $379 per week, plus $69 for additional days that sleeps 5 (there are 4 of us). Seems great value. I know by the time we rent that and pay the site fee we could stay in a moderate hotel but it just wouldn't be the same experience. We're all really excited about staying at Fort Wilderness. We've just got to nail down our dates yet. We are going on a cruise also so we have to make a decision on which week we are doing which is proving difficult.
Now to decide what site to book. I've only tent camped before. Do we need the full hookup up site to be able to use water etc in the van? What loops are these in. Thinking we would prefer to be closer to the pool.