Have you heard of and evaluated Paligo (www.paligo.net)? Probably worth a look at if you don’t know of it. Cloud-based authoring solution, based on Docbook. No XML or previous structured authoring knowledge required. It’s a full CCMS, very powerful but as SaaS. So you get the full monty for what you would have paid $10Ks previously just to install.
[Note I am representing Paligo but it shouldn’t stop you checking Paligo before deciding]