From: Vermont, USA
Ok, I'm not sure if everyone realized that, probably I was the only one who was confused though. :-)
Anyway, my recommendation is to with the newest one and if you like it, work your way backwards. The Longest Day is IMHO much better than CCV was and many of the engine improvements are also in WAR. If you like the Eastern Front, COI is the best CC for that theater. Modern Tactics is also interesting for modern warfare buffs, though keep in mind it doesn't have a typical CC campaign, but it does have robust multiplayer support.