The fifty dollar license would probably fulfill your needs. You won't need more than five people to collaborate on building the site. Viewers without editing powers are not limited; they don't count in the five. If I understood the guy correctly at MacWorld, you can allow comments with unlimited users that don't count against the five collaborators.

His point about why iServer is worth the fifty bucks has some merits. As another has said, sure you can do it with freely available software, but with iServer it's plug and play. Install the software and you're set to go, more or less. You don't kneed to know Apache, PHP, or any of the other apps you need to hook together. I'm sure this is trivially easy for many people, but I'm uninterested in getting under the hood to build a server.