The website logotournament.com offers a service for designers and owners of companies. You can define how much money you would like to spend on a new logo set and what this logo should look like.
Just take a look at the contest brief of Move Ahead. I've made a screenshot of their website. They use the typical Joomla icon. Their logo isn't very good.
Now take a look at the best submitted logos. Great, aren't they? At the moment, 105 logos have been submitted for \$375. The company can decide which ones they like and rank them. They pay only for one logo set, but they can choose from 105 logos.
Note: This is a quick post from one of my old blogs.