I am happy to have come across a site for all your clipart needs! It's MyGrafico! At MyGrafico you can choose high quality digital clipart sets from a host of fantastic designers. The site is easy to navigate and registration is easy. There are daily sales and a host of freebies just for you.
If you're planning to use clipart from this site for your commercial projects then a commercial license is required. In some cases a credit to the author is required and in other cases a fee.
Go take a look yourself!