Same as you I have no great knowledge of their repertoir, so my proposition would be "Spiritual Black Dimensions" and "World Misanthropy". There is quite a few songs in those two albums you might admire... I'm sure, you'll get more qualified respones from the other guys.
World misanthropy isn't even an album, but a dvd. Spiritual black dimensions is also imho Dimmu's least interesting album.
Try Stormblåst or Enthrone darkness triumphant.