Project Management software suggestions

Hi,
I have been looking for a project management software for my company. Specifically I am wondering if there is a software that will automatically update the completion percentage of projects as tasks are completed, or if that is something that it inherit in most PM software. So far I have tried demo versions of TaskMerlin, Project KickStart, and dotProject, and have not noticed this capability unless I am doing something wrong. Any help will be appreciated. Thanks in advance!