How much space does WoW with expansions REALLY take up?

Despite every possible objection to this "game" even being installed on this computer that I have (and there are many), with my recent endeavor to clear out space on the hard drive has left my dad insisting on at least one of the expansions he has (but there hasn't been room for) be installed, and presumably eating up all the space I cleared out. So with the expansions and patches, exactly how much space does World of Warcrap take up (both with and without Cataclysm (he doesn't have that one.... yet))? Just the base game alone, despite the box saying it only requires 10 GB and recently clearing out 7 GB of updates multiple sites were saying were okay to delete, it still takes up 16 GB! And with both EPs saying they require 15 GB a piece, based on the base game's inflation, that means base game and first two EPs would eat up something like 60 GB!!!

So really, how much space would it require, expanded (again, both with and without Cataclysm) and patched?