You should seriously consider using Adobe Illustrator if you can get your hands on it. I'm all for latex + beamer for talks, but you might end up waste far too much time on the formatting if you try to use latex. If you do this, you'll need to copy in your equations (as pdf with outlined fonts) created with some tool like LaTeXit (for Mac) or otherwise some equivalent. On the plus side, the added cost of putting in math will help you focus on the graphical content.