I’m a huge fan of WordPress. Not because it’s the best CMS out there but because through a combination of experience and the light weight, flexibility of the platform I’ve found I can build most anything I need quickly and easily.
At the heart of this (aside for WordPress itself of course) are a range of plugins that I deploy to pretty much every single site I build. Some are commercial and I have no problem paying the developers for what is often an awesome amount of work. Some are free, some are complex and some are really simple.