I am just trying to complete my collection as well. I haven't really played any of the expansions, I spent as much time as I could finding all of the expansions before they went out of print. I am planning on starting with Call to Arms, as per suggested by a friend who plays the game and has all of the expansions. I also can't completely recommend using ebay to complete a set. I just managed to get a hold of the Hundred Years War expansion for... dare I say it.... more money than the base game actually costs. I'm hoping it will be worth it...