After reading Targan's answer I got to thinking (yeah I know, dangerous or what!), while the question asks what edition we might play, I think there needs to be some discrimination between rules and timeline.
So to go further, I use the 2.2 rules but with a modified version of the 2.2 timeline. I have no problem with the 1st Ed. timeline but I do like the extra vehicles and equipment that a later war start allows - what can I say, I'm a gearhead and I like big gear lists