CMS/Application platforms

So I am about to start building a web site/application and I realized that using some form of platform would make my life easier. I have looked at XOOPS as well as ampoliros, Has anyone used these who would like to comment on what they are like to work in. Or if you have another CMS that you like please say something.

Also Both seem to spend a lot of time showing you how to use an existing module but in neither case could I find anything on how to build your own database drivien components in them.