Ryan Lorence Syfargo
Great question! I'll be going more into depth about the answer later this week. The short answer is all versions.
But, keep in mind, Omen: Edge of the Aegean was designed to be a stand alone game. If you like Omen: aRoW, there's a really good chance you'll like Omen: EotA.
Like? I don't like Omen, i love it! In fact i have 3 versions of it, and 2x the 2nd edition.
I ask because i want to know if i can add it to my multiple copies.