Loads of people come to us at work saying "we need a website" (work for a marketing company) and the first question we ask is "why?".
Once you've worked out the answer in real detail by playing devil's advocate with yourself, and only then, start thinking about the technology (could a decent fb, G+ or Linkedin page get you a more suitable online presence, for example). Worrying about Joomla v Concrete5 v Wordpress etc etc etc before nailing your proposition (I'm assuming you're selling something?) is a real distraction.
If you've done the proposition bit and really need a site, Wordpress is pretty good - loads of themes available for not a lot of money.