Microsoft Project is expensive, very expensive. But once you started using it, you can’t stand not having a nice clean GANTT project chart. Why not get a free Microsoft Project? Even better than downloading MS-Project for free, I am proposing you to use an on-line GANTT chart/project builder that is completely free and works on-line: Gantter.
I have been really impressed by the quality of such a software program. It may need to get some interface polish for Opera users (I had a couple of little display bugs), but the operation is fully adequate for many projects.