Another option to throw into the mix is Sentry CMS:
The emphasis of this one is on simplicity. Sentry is very quick and easy to get working. It’ll do simple editable areas of text really easily, but does not have blog support. Perhaps consider the free MicroBlog stack if you need to pull a Tumblr blog into your webpage?
If you are concerned about complicated or escalating licensing costs, then Sentry might be a good one to look at. The licensing has recently been relaxed and its basically a stack you buy once to use over all your projects. Technical support is free for the setup of your first website with Sentry.