I'm all for this and I am a huge fan of ROTLD. I haven't bought the US Blu-Ray yet (My Blu-Ray Drive died) but I have seen it and own almost every available version available. I'd say go with the 5.1 MA mix - but make sure you reinstate the original voice of the Tar-Man (Can be found on the The Dead Have Risen Documentary in clearer form).
Any other help you need???