If it wasn't for the fact that Gen Con is pretty much my one big trip per year I would totally try to make it over the mountains to St. Louis for Fear the Con. Drats.
I would totally recommend Revelations and/or The Fall Without End there Caleb. They really feel like they'd work well in a con game type environment, especially in something rules light like Cthulhu Dark. Better Angels can definitely be interesting at a con, I played in one of Greg Stolze's Gen Con games and boy, oh boy did that get ugly. The whole anecdote in the ORE panel about a guy almost hard-boiling his daughter, that was me. But anyway, something Eclipse Phase could be cool too, Continuity or Think Before Asking run with sample characters would probably work well. Those are my suggestions, hope they help and that you guys have a good time!
