Civilization V to use Steam/Steamworks

[al Roumi]

but Amazon version is usually far cheaper than Steam. it having to be registered on Steam is a plus, as it allows me to have the game on Steam for cheaper than buying it from Steam.

Um, in the UK, Amazon is often cheaper than Steam, especially on release. The only time Steam really gets an advantage is the "steam sales", but they are usually quite late.

My fingers are firmly crossed that the UK's economy doesn't tank so much that this situation changes...