The UK DVD from Bluelight - while essentially the director's cut - is still slightly edited, so stay away from that. It's out of print and a bit hard to find, now, anyway. A second UK DVD was released in 2014 from Second Sight, which is both uncut and anamorphic.
The French disc from Éditions Montparnasse once again has it best - featuring an interview with Breillat - but does not feature English subtitles. It also has a much better cover than the ultra-cheesy US DVD (to be fair, yes, the US cover is based on the film's poster... but the US poster was super cheesy; and the French DVD cover is based on the far superior, original French poster). It's also included in Éditions Montparnasse's Catherine Breillat boxed set.