Make sure they have the theatrical versions and not the SE. Criterion prefers the versions that are according to the director's intentions.

On the actual covers of the Blu-rays: wow; that is making all the DVD covers look a like Rembrandt. I was at work so I could not comment earlier, but my god, no film should have box art like that. It looks like a crappy religious painting- there is fan art that is on par with those covers. I just love how LFL always aims for the zero in their products nowadays. 20 years from now they may start going for negative scores. I can't believe an adult actually helped choose this kind of artwork.