Via Gadgetopia, I found a very good article on how to select a CMS.
I specifically like the paragraph on prototype, prototype and prototype.

That is totally true. The best think you can do to know if a CMS matches your needs is to install it and try to develop a small prototype of what could be your web site.

At the beginning of the development of QuickelSoft CMS 2, I thought the best way to showcase the product was to have a demo web site where you can test-drive the CMS directly; you do not have to install anything. It is quick and painless for a first approach. I also wanted to have some videos to help you visualize how it works.  But it just gives a taste of the product and you really have to put your hands in it to discover its full power.

The article also says that you should not only focus on the feature list. Correct again!
When you look at different CMS products, you will see they all have more or less the same features.

But how easy is it to use the one you will use 80% of your time?

That is why a prototype is absolutely mandatory.

My best advice when you have to select a CMS is to already have an idea of what your site will look like and how you want to organize your content. Begin with the site and then select the product and try to apply your logic to the CMS.  Develop!

And with QuickelSoft CMS, you have plenty of time to develop your prototype, the trial version is not time-limited and the support is free. So abuse!