For me it's:
For the Loveless
Martyre
Paradise
Saturn
Veronika
Basically Thomas AG Jensen could talk and growl over a car alarm and I'd put it on repeat. That guy is amazing.
EDIT: After doing some snooping around on Metal Archives, I discovered that between 'Martyre' and 'Veronika' three of the six members left, and between 'Veronika' and 'Saturn' all members changed except for the singer! Admittedly, one of those changes was to bring the old bass player back from the 'Martyre' era, but that fundamentally means that on 'Saturn in Ascension' it was Thomas with an entirely different band from the group that recorded the previous album. And of the 'classic line-up' that recorded the first three releases, only Thomas and the returning bass player remain.
Doesn't mean the music has to suck (it doesn't, it's awesome), but it's an interesting dynamic.