When I looked into Wiki systems, I liked the fact that it was easy to set up. The one thing that I didn't like about it is that the user needs to use special syntax to create links. Also I am not sure if there is a way to upload images when creating a page
I decided to go with postnuke, since there are supposedly some security holes with phpNuke.
There are some other cool features of postNuke. forums, News, faqs and comments.
I have finished the first version of the website. It can be found at http://www.windsortownhomes.com. I really like the permission system (Once I figured it out.)