Advise CMS

joomla — quick and lousy, a lot of bad code in extensions, but it works quite decently

A popular free open source not suitable?
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In my opinion, in General, the situation among the free systems management with open source is this:
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There are two main universal CMS: Drupal and Joomla. They have a bunch of extensions average scall, which, in the presence "of a file" can bring to mind. There is the solution for your problem.
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Is Wordpress — easy to use interface too, a lot of extensions, but it focuses on blogs and from my experience, are not flexible enough, that it could be easy to repurpose.
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There Is Typo3. CMS has a long history, used in many large companies. The interface is neat, nothing more to say I can not very difficult, could not understand, they say there's a huge functionality out of the box.
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There Is A ModX. A fairly young CMS extension is not enough and I would not say that everything is as perfect as they say.
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I probably would advise Joomla. Though many people reasonably don't like, but it is much easier for Drupal, and extensions and templates more. Among the very simple hardly be able to find something adequate.

LiveStreet? In my opinion just what you need. Typically a popular theme frameworks. Pluginname dopisivati what you want, there is easy all.

Drupal. Ready high functionality, high opportunities for development.
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Complexity is the flip side of functionality, footprint, too — you just have to know how to cook ;)

I like the DLE it is quite simple

in the direction of Drupal, I would not look complicated + there are enough resources.
better start Joomla no

Cogear, Livestreer, Wordpress.
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The first CMS is buggy, but in active development, has everything you need right out of the box, with free. It is fast, reliable.
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The second CMS is good from the point of view of maturity, reliable, many available modules, but the best of them — paid, while "out of the box" is not available very much.
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The third is a CMS for blog posts, lots of plugins and templates, but resources eats three throat, unlike the previous two CMS.
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Choose. I chose Cogear and have no regrets, but Livestreet at least not worse.