I wonder if Platinum contains all the single player of the original DoW and WA expansion? This was the only caveat to buying the Dark Crusade DVD. You had to have seperate installs to play the old single player campaign (thus having 3 copies of the same thing for multi).

Oh and as far as multi goes, go platinum. So much stuff was changed in multi between each expansion that the game is almost unrecognizable when comparing the original to Dark Crusade. Not to mention the majority of public matches online are going to be Dark Crusade based. Only get lesser if you plan to never play multi.