Font choices for displays or larger signage should be simple and easily readable...in other words...BOOORRING...
Well not exactly, there are still some tricks to make your message both informative and interesting to the eye. Vary the size of the words and make your most important message jump out. That doesn't mean using 21 pt text vs. 24 pt text. Go for it - try your key words at twice the size of your support copy. Vary the font weight. Use all caps in one or two places. Create interest with underlines or outlines, but be choosey. A black outline in one or two places works - around every word it has no impact.