Advanced Project Management Features

We have the Jira project management module but are looking for a more high-level, advanced project management tool to manage 150 – 200 current or future projects. We are looking for advanced functionality such as professional-looking gantt charts and being able to link projects that have dependencies to each other. With linking dependencies, we would like to be able to adjust a certain project’s start / finish date and then have the other projects that are dependent on that one have their dates adjusted automatically. In talking to a Jira product specialist it sounds like Jira does not have this capability. I am curious if other any other Jira customers need this capability and if so what you are using to accomplish it. If you are using something else does it tie into Jira or can it be built on top of Jira? Thanks!