With so many expansions, I’m not sure what to buy, exactly.I ran into this myself. No wonder:
...NCSoft published at least two dozen different editions of Guild Wars...After examining GuildWiki and the NCsoft Store I decided to get them all, which means buying Guild Wars: The Complete Collection, but it's a Europe-only product and the best one can do in North America is Guild Wars Trilogy, purchasing Eye of the North separately.
In contrast, Firaxis has always done this well. It's now offering Sid Meier's Civilization IV: The Complete Edition which bundles everything: Civilization IV and the expansions Warlords amd Beyond the Sword, along with Civilization IV: Colonization.