I've only listened to their first two albums. Would you say Durch Den Traum is a good starting point for their later material?
Regarding their recent material, yes, Durch Den Traum is fantastic and a good starting point. But understand it's not the aggressive melodic black metal that you'd find on their early albums, it's hardly even metal. The music is peaceful, dark and atmospheric, and very mood-oriented. More acoustic guitar and whispered vocals. Hexenwind is similar because they were written and recorded at the same time, but I don't think it's as good. And In Luft geritzt is an acoustic album, not one that I cared too much for.
Also, you might want to check out their third album, if you've only heard the first two.